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usb: split usb_new_device for clarity and refactoring
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / usb / core / hub.c
CommitLineData
1da177e4
LT		 1/*
2 * USB hub driver.
3 *
4 * (C) Copyright 1999 Linus Torvalds
5 * (C) Copyright 1999 Johannes Erdfelt
6 * (C) Copyright 1999 Gregory P. Smith
7 * (C) Copyright 2001 Brad Hards (bhards@bigpond.net.au)
8 *
9 */
10
1da177e4
LT		 11#include <linux/kernel.h>
12#include <linux/errno.h>
13#include <linux/module.h>
14#include <linux/moduleparam.h>
15#include <linux/completion.h>
16#include <linux/sched.h>
17#include <linux/list.h>
18#include <linux/slab.h>
1da177e4
LT		 19#include <linux/ioctl.h>
20#include <linux/usb.h>
21#include <linux/usbdevice_fs.h>
9c8d6178 22#include <linux/kthread.h>
4186ecf8 23#include <linux/mutex.h>
7dfb7103 24#include <linux/freezer.h>
1da177e4
LT		 25
26#include <asm/semaphore.h>
27#include <asm/uaccess.h>
28#include <asm/byteorder.h>
29
30#include "usb.h"
31#include "hcd.h"
32#include "hub.h"
33
54515fe5
AS		 34#ifdef CONFIG_USB_PERSIST
35#define USB_PERSIST 1
36#else
37#define USB_PERSIST 0
38#endif
39
1bb5f66b
AS		 40struct usb_hub {
41 struct device *intfdev; /* the "interface" device */
42 struct usb_device *hdev;
e8054854 43 struct kref kref;
1bb5f66b
AS		 44 struct urb *urb; /* for interrupt polling pipe */
45
46 /* buffer for urb ... with extra space in case of babble */
47 char (*buffer)[8];
48 dma_addr_t buffer_dma; /* DMA address for buffer */
49 union {
50 struct usb_hub_status hub;
51 struct usb_port_status port;
52 } *status; /* buffer for status reports */
db90e7a1 53 struct mutex status_mutex; /* for the status buffer */
1bb5f66b
AS		 54
55 int error; /* last reported error */
56 int nerrors; /* track consecutive errors */
57
58 struct list_head event_list; /* hubs w/data or errs ready */
59 unsigned long event_bits[1]; /* status change bitmask */
60 unsigned long change_bits[1]; /* ports with logical connect
61 status change */
62 unsigned long busy_bits[1]; /* ports being reset or
63 resumed */
64#if USB_MAXCHILDREN > 31 /* 8*sizeof(unsigned long) - 1 */
65#error event_bits[] is too short!
66#endif
67
68 struct usb_hub_descriptor *descriptor; /* class descriptor */
69 struct usb_tt tt; /* Transaction Translator */
70
71 unsigned mA_per_port; /* current for each child */
72
73 unsigned limited_power:1;
74 unsigned quiescing:1;
75 unsigned activating:1;
e8054854 76 unsigned disconnected:1;
1bb5f66b
AS		 77
78 unsigned has_indicators:1;
79 u8 indicator[USB_MAXCHILDREN];
6d5aefb8 80 struct delayed_work leds;
1bb5f66b
AS		 81};
82
83
1da177e4 84/* Protect struct usb_device->state and ->children members
9ad3d6cc 85 * Note: Both are also protected by ->dev.sem, except that ->state can
1da177e4
LT		 86 * change to USB_STATE_NOTATTACHED even when the semaphore isn't held. */
87static DEFINE_SPINLOCK(device_state_lock);
88
89/* khubd's worklist and its lock */
90static DEFINE_SPINLOCK(hub_event_lock);
91static LIST_HEAD(hub_event_list); /* List of hubs needing servicing */
92
93/* Wakes up khubd */
94static DECLARE_WAIT_QUEUE_HEAD(khubd_wait);
95
9c8d6178 96static struct task_struct *khubd_task;
1da177e4
LT		 97
98/* cycle leds on hubs that aren't blinking for attention */
99static int blinkenlights = 0;
100module_param (blinkenlights, bool, S_IRUGO);
101MODULE_PARM_DESC (blinkenlights, "true to cycle leds on hubs");
102
103/*
104 * As of 2.6.10 we introduce a new USB device initialization scheme which
105 * closely resembles the way Windows works. Hopefully it will be compatible
106 * with a wider range of devices than the old scheme. However some previously
107 * working devices may start giving rise to "device not accepting address"
108 * errors; if that happens the user can try the old scheme by adjusting the
109 * following module parameters.
110 *
111 * For maximum flexibility there are two boolean parameters to control the
112 * hub driver's behavior. On the first initialization attempt, if the
113 * "old_scheme_first" parameter is set then the old scheme will be used,
114 * otherwise the new scheme is used. If that fails and "use_both_schemes"
115 * is set, then the driver will make another attempt, using the other scheme.
116 */
117static int old_scheme_first = 0;
118module_param(old_scheme_first, bool, S_IRUGO | S_IWUSR);
119MODULE_PARM_DESC(old_scheme_first,
120 "start with the old device initialization scheme");
121
122static int use_both_schemes = 1;
123module_param(use_both_schemes, bool, S_IRUGO | S_IWUSR);
124MODULE_PARM_DESC(use_both_schemes,
125 "try the other device initialization scheme if the "
126 "first one fails");
127
128
404d5b18 129static inline char *portspeed(int portstatus)
1da177e4
LT		 130{
131 if (portstatus & (1 << USB_PORT_FEAT_HIGHSPEED))
132 return "480 Mb/s";
133 else if (portstatus & (1 << USB_PORT_FEAT_LOWSPEED))
134 return "1.5 Mb/s";
135 else
136 return "12 Mb/s";
137}
1da177e4
LT		 138
139/* Note that hdev or one of its children must be locked! */
140static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
141{
142 return usb_get_intfdata(hdev->actconfig->interface[0]);
143}
144
145/* USB 2.0 spec Section 11.24.4.5 */
146static int get_hub_descriptor(struct usb_device *hdev, void *data, int size)
147{
148 int i, ret;
149
150 for (i = 0; i < 3; i++) {
151 ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
152 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
153 USB_DT_HUB << 8, 0, data, size,
154 USB_CTRL_GET_TIMEOUT);
155 if (ret >= (USB_DT_HUB_NONVAR_SIZE + 2))
156 return ret;
157 }
158 return -EINVAL;
159}
160
161/*
162 * USB 2.0 spec Section 11.24.2.1
163 */
164static int clear_hub_feature(struct usb_device *hdev, int feature)
165{
166 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
167 USB_REQ_CLEAR_FEATURE, USB_RT_HUB, feature, 0, NULL, 0, 1000);
168}
169
170/*
171 * USB 2.0 spec Section 11.24.2.2
172 */
173static int clear_port_feature(struct usb_device *hdev, int port1, int feature)
174{
175 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
176 USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
177 NULL, 0, 1000);
178}
179
180/*
181 * USB 2.0 spec Section 11.24.2.13
182 */
183static int set_port_feature(struct usb_device *hdev, int port1, int feature)
184{
185 return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
186 USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
187 NULL, 0, 1000);
188}
189
190/*
191 * USB 2.0 spec Section 11.24.2.7.1.10 and table 11-7
192 * for info about using port indicators
193 */
194static void set_port_led(
195 struct usb_hub *hub,
196 int port1,
197 int selector
198)
199{
200 int status = set_port_feature(hub->hdev, (selector << 8) | port1,
201 USB_PORT_FEAT_INDICATOR);
202 if (status < 0)
203 dev_dbg (hub->intfdev,
204 "port %d indicator %s status %d\n",
205 port1,
206 ({ char *s; switch (selector) {
207 case HUB_LED_AMBER: s = "amber"; break;
208 case HUB_LED_GREEN: s = "green"; break;
209 case HUB_LED_OFF: s = "off"; break;
210 case HUB_LED_AUTO: s = "auto"; break;
211 default: s = "??"; break;
212 }; s; }),
213 status);
214}
215
216#define LED_CYCLE_PERIOD ((2*HZ)/3)
217
c4028958 218static void led_work (struct work_struct *work)
1da177e4 219{
c4028958
DH		 220 struct usb_hub *hub =
221 container_of(work, struct usb_hub, leds.work);
1da177e4
LT		 222 struct usb_device *hdev = hub->hdev;
223 unsigned i;
224 unsigned changed = 0;
225 int cursor = -1;
226
227 if (hdev->state != USB_STATE_CONFIGURED || hub->quiescing)
228 return;
229
230 for (i = 0; i < hub->descriptor->bNbrPorts; i++) {
231 unsigned selector, mode;
232
233 /* 30%-50% duty cycle */
234
235 switch (hub->indicator[i]) {
236 /* cycle marker */
237 case INDICATOR_CYCLE:
238 cursor = i;
239 selector = HUB_LED_AUTO;
240 mode = INDICATOR_AUTO;
241 break;
242 /* blinking green = sw attention */
243 case INDICATOR_GREEN_BLINK:
244 selector = HUB_LED_GREEN;
245 mode = INDICATOR_GREEN_BLINK_OFF;
246 break;
247 case INDICATOR_GREEN_BLINK_OFF:
248 selector = HUB_LED_OFF;
249 mode = INDICATOR_GREEN_BLINK;
250 break;
251 /* blinking amber = hw attention */
252 case INDICATOR_AMBER_BLINK:
253 selector = HUB_LED_AMBER;
254 mode = INDICATOR_AMBER_BLINK_OFF;
255 break;
256 case INDICATOR_AMBER_BLINK_OFF:
257 selector = HUB_LED_OFF;
258 mode = INDICATOR_AMBER_BLINK;
259 break;
260 /* blink green/amber = reserved */
261 case INDICATOR_ALT_BLINK:
262 selector = HUB_LED_GREEN;
263 mode = INDICATOR_ALT_BLINK_OFF;
264 break;
265 case INDICATOR_ALT_BLINK_OFF:
266 selector = HUB_LED_AMBER;
267 mode = INDICATOR_ALT_BLINK;
268 break;
269 default:
270 continue;
271 }
272 if (selector != HUB_LED_AUTO)
273 changed = 1;
274 set_port_led(hub, i + 1, selector);
275 hub->indicator[i] = mode;
276 }
277 if (!changed && blinkenlights) {
278 cursor++;
279 cursor %= hub->descriptor->bNbrPorts;
280 set_port_led(hub, cursor + 1, HUB_LED_GREEN);
281 hub->indicator[cursor] = INDICATOR_CYCLE;
282 changed++;
283 }
284 if (changed)
285 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
286}
287
288/* use a short timeout for hub/port status fetches */
289#define USB_STS_TIMEOUT 1000
290#define USB_STS_RETRIES 5
291
292/*
293 * USB 2.0 spec Section 11.24.2.6
294 */
295static int get_hub_status(struct usb_device *hdev,
296 struct usb_hub_status *data)
297{
298 int i, status = -ETIMEDOUT;
299
300 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
301 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
302 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_HUB, 0, 0,
303 data, sizeof(*data), USB_STS_TIMEOUT);
304 }
305 return status;
306}
307
308/*
309 * USB 2.0 spec Section 11.24.2.7
310 */
311static int get_port_status(struct usb_device *hdev, int port1,
312 struct usb_port_status *data)
313{
314 int i, status = -ETIMEDOUT;
315
316 for (i = 0; i < USB_STS_RETRIES && status == -ETIMEDOUT; i++) {
317 status = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
318 USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, port1,
319 data, sizeof(*data), USB_STS_TIMEOUT);
320 }
321 return status;
322}
323
324static void kick_khubd(struct usb_hub *hub)
325{
326 unsigned long flags;
327
40f122f3
AS		 328 /* Suppress autosuspend until khubd runs */
329 to_usb_interface(hub->intfdev)->pm_usage_cnt = 1;
330
1da177e4 331 spin_lock_irqsave(&hub_event_lock, flags);
e8054854 332 if (!hub->disconnected & list_empty(&hub->event_list)) {
1da177e4
LT		 333 list_add_tail(&hub->event_list, &hub_event_list);
334 wake_up(&khubd_wait);
335 }
336 spin_unlock_irqrestore(&hub_event_lock, flags);
337}
338
339void usb_kick_khubd(struct usb_device *hdev)
340{
e8054854 341 /* FIXME: What if hdev isn't bound to the hub driver? */
1da177e4
LT		 342 kick_khubd(hdev_to_hub(hdev));
343}
344
345
346/* completion function, fires on port status changes and various faults */
7d12e780 347static void hub_irq(struct urb *urb)
1da177e4 348{
ec17cf1c 349 struct usb_hub *hub = urb->context;
1da177e4
LT		 350 int status;
351 int i;
352 unsigned long bits;
353
354 switch (urb->status) {
355 case -ENOENT: /* synchronous unlink */
356 case -ECONNRESET: /* async unlink */
357 case -ESHUTDOWN: /* hardware going away */
358 return;
359
360 default: /* presumably an error */
361 /* Cause a hub reset after 10 consecutive errors */
362 dev_dbg (hub->intfdev, "transfer --> %d\n", urb->status);
363 if ((++hub->nerrors < 10) || hub->error)
364 goto resubmit;
365 hub->error = urb->status;
366 /* FALL THROUGH */
ec17cf1c 367
1da177e4
LT		 368 /* let khubd handle things */
369 case 0: /* we got data: port status changed */
370 bits = 0;
371 for (i = 0; i < urb->actual_length; ++i)
372 bits |= ((unsigned long) ((*hub->buffer)[i]))
373 << (i*8);
374 hub->event_bits[0] = bits;
375 break;
376 }
377
378 hub->nerrors = 0;
379
380 /* Something happened, let khubd figure it out */
381 kick_khubd(hub);
382
383resubmit:
384 if (hub->quiescing)
385 return;
386
387 if ((status = usb_submit_urb (hub->urb, GFP_ATOMIC)) != 0
388 && status != -ENODEV && status != -EPERM)
389 dev_err (hub->intfdev, "resubmit --> %d\n", status);
390}
391
392/* USB 2.0 spec Section 11.24.2.3 */
393static inline int
394hub_clear_tt_buffer (struct usb_device *hdev, u16 devinfo, u16 tt)
395{
396 return usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
397 HUB_CLEAR_TT_BUFFER, USB_RT_PORT, devinfo,
398 tt, NULL, 0, 1000);
399}
400
401/*
402 * enumeration blocks khubd for a long time. we use keventd instead, since
403 * long blocking there is the exception, not the rule. accordingly, HCDs
404 * talking to TTs must queue control transfers (not just bulk and iso), so
405 * both can talk to the same hub concurrently.
406 */
c4028958 407static void hub_tt_kevent (struct work_struct *work)
1da177e4 408{
c4028958
DH		 409 struct usb_hub *hub =
410 container_of(work, struct usb_hub, tt.kevent);
1da177e4 411 unsigned long flags;
55e5fdfa 412 int limit = 100;
1da177e4
LT		 413
414 spin_lock_irqsave (&hub->tt.lock, flags);
55e5fdfa 415 while (--limit && !list_empty (&hub->tt.clear_list)) {
1da177e4
LT		 416 struct list_head *temp;
417 struct usb_tt_clear *clear;
418 struct usb_device *hdev = hub->hdev;
419 int status;
420
421 temp = hub->tt.clear_list.next;
422 clear = list_entry (temp, struct usb_tt_clear, clear_list);
423 list_del (&clear->clear_list);
424
425 /* drop lock so HCD can concurrently report other TT errors */
426 spin_unlock_irqrestore (&hub->tt.lock, flags);
427 status = hub_clear_tt_buffer (hdev, clear->devinfo, clear->tt);
428 spin_lock_irqsave (&hub->tt.lock, flags);
429
430 if (status)
431 dev_err (&hdev->dev,
432 "clear tt %d (%04x) error %d\n",
433 clear->tt, clear->devinfo, status);
1bc3c9e1 434 kfree(clear);
1da177e4
LT		 435 }
436 spin_unlock_irqrestore (&hub->tt.lock, flags);
437}
438
439/**
440 * usb_hub_tt_clear_buffer - clear control/bulk TT state in high speed hub
441 * @udev: the device whose split transaction failed
442 * @pipe: identifies the endpoint of the failed transaction
443 *
444 * High speed HCDs use this to tell the hub driver that some split control or
445 * bulk transaction failed in a way that requires clearing internal state of
446 * a transaction translator. This is normally detected (and reported) from
447 * interrupt context.
448 *
449 * It may not be possible for that hub to handle additional full (or low)
450 * speed transactions until that state is fully cleared out.
451 */
452void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
453{
454 struct usb_tt *tt = udev->tt;
455 unsigned long flags;
456 struct usb_tt_clear *clear;
457
458 /* we've got to cope with an arbitrary number of pending TT clears,
459 * since each TT has "at least two" buffers that can need it (and
460 * there can be many TTs per hub). even if they're uncommon.
461 */
54e6ecb2 462 if ((clear = kmalloc (sizeof *clear, GFP_ATOMIC)) == NULL) {
1da177e4
LT		 463 dev_err (&udev->dev, "can't save CLEAR_TT_BUFFER state\n");
464 /* FIXME recover somehow ... RESET_TT? */
465 return;
466 }
467
468 /* info that CLEAR_TT_BUFFER needs */
469 clear->tt = tt->multi ? udev->ttport : 1;
470 clear->devinfo = usb_pipeendpoint (pipe);
471 clear->devinfo |= udev->devnum << 4;
472 clear->devinfo |= usb_pipecontrol (pipe)
473 ? (USB_ENDPOINT_XFER_CONTROL << 11)
474 : (USB_ENDPOINT_XFER_BULK << 11);
475 if (usb_pipein (pipe))
476 clear->devinfo |= 1 << 15;
477
478 /* tell keventd to clear state for this TT */
479 spin_lock_irqsave (&tt->lock, flags);
480 list_add_tail (&clear->clear_list, &tt->clear_list);
481 schedule_work (&tt->kevent);
482 spin_unlock_irqrestore (&tt->lock, flags);
483}
484
485static void hub_power_on(struct usb_hub *hub)
486{
487 int port1;
b789696a 488 unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
4489a571
AS		 489 u16 wHubCharacteristics =
490 le16_to_cpu(hub->descriptor->wHubCharacteristics);
491
492 /* Enable power on each port. Some hubs have reserved values
493 * of LPSM (> 2) in their descriptors, even though they are
494 * USB 2.0 hubs. Some hubs do not implement port-power switching
495 * but only emulate it. In all cases, the ports won't work
496 * unless we send these messages to the hub.
497 */
498 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2)
1da177e4 499 dev_dbg(hub->intfdev, "enabling power on all ports\n");
4489a571
AS		 500 else
501 dev_dbg(hub->intfdev, "trying to enable port power on "
502 "non-switchable hub\n");
503 for (port1 = 1; port1 <= hub->descriptor->bNbrPorts; port1++)
504 set_port_feature(hub->hdev, port1, USB_PORT_FEAT_POWER);
1da177e4 505
b789696a
DB		 506 /* Wait at least 100 msec for power to become stable */
507 msleep(max(pgood_delay, (unsigned) 100));
1da177e4
LT		 508}
509
02c399ee 510static void hub_quiesce(struct usb_hub *hub)
1da177e4 511{
979d5199 512 /* (nonblocking) khubd and related activity won't re-trigger */
1da177e4 513 hub->quiescing = 1;
c9f89fa4 514 hub->activating = 0;
979d5199 515
979d5199 516 /* (blocking) stop khubd and related activity */
1da177e4
LT		 517 usb_kill_urb(hub->urb);
518 if (hub->has_indicators)
519 cancel_delayed_work(&hub->leds);
520 if (hub->has_indicators || hub->tt.hub)
521 flush_scheduled_work();
522}
523
524static void hub_activate(struct usb_hub *hub)
525{
526 int status;
527
528 hub->quiescing = 0;
529 hub->activating = 1;
40f122f3 530
1da177e4
LT		 531 status = usb_submit_urb(hub->urb, GFP_NOIO);
532 if (status < 0)
533 dev_err(hub->intfdev, "activate --> %d\n", status);
534 if (hub->has_indicators && blinkenlights)
535 schedule_delayed_work(&hub->leds, LED_CYCLE_PERIOD);
536
537 /* scan all ports ASAP */
538 kick_khubd(hub);
539}
540
541static int hub_hub_status(struct usb_hub *hub,
542 u16 *status, u16 *change)
543{
544 int ret;
545
db90e7a1 546 mutex_lock(&hub->status_mutex);
1da177e4
LT		 547 ret = get_hub_status(hub->hdev, &hub->status->hub);
548 if (ret < 0)
549 dev_err (hub->intfdev,
550 "%s failed (err = %d)\n", __FUNCTION__, ret);
551 else {
552 *status = le16_to_cpu(hub->status->hub.wHubStatus);
553 *change = le16_to_cpu(hub->status->hub.wHubChange);
554 ret = 0;
555 }
db90e7a1 556 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 557 return ret;
558}
559
8b28c752
AS		 560static int hub_port_disable(struct usb_hub *hub, int port1, int set_state)
561{
562 struct usb_device *hdev = hub->hdev;
0458d5b4 563 int ret = 0;
8b28c752 564
0458d5b4 565 if (hdev->children[port1-1] && set_state)
8b28c752
AS		 566 usb_set_device_state(hdev->children[port1-1],
567 USB_STATE_NOTATTACHED);
0458d5b4
AS		 568 if (!hub->error)
569 ret = clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
8b28c752
AS		 570 if (ret)
571 dev_err(hub->intfdev, "cannot disable port %d (err = %d)\n",
0458d5b4 572 port1, ret);
8b28c752
AS		 573 return ret;
574}
575
0458d5b4
AS		 576/*
577 * Disable a port and mark a logical connnect-change event, so that some
578 * time later khubd will disconnect() any existing usb_device on the port
579 * and will re-enumerate if there actually is a device attached.
580 */
581static void hub_port_logical_disconnect(struct usb_hub *hub, int port1)
582{
583 dev_dbg(hub->intfdev, "logical disconnect on port %d\n", port1);
584 hub_port_disable(hub, port1, 1);
7d069b7d 585
0458d5b4
AS		 586 /* FIXME let caller ask to power down the port:
587 * - some devices won't enumerate without a VBUS power cycle
588 * - SRP saves power that way
589 * - ... new call, TBD ...
590 * That's easy if this hub can switch power per-port, and
591 * khubd reactivates the port later (timer, SRP, etc).
592 * Powerdown must be optional, because of reset/DFU.
593 */
594
595 set_bit(port1, hub->change_bits);
596 kick_khubd(hub);
597}
598
0458d5b4 599/* caller has locked the hub device */
f07600cf 600static int hub_pre_reset(struct usb_interface *intf)
0458d5b4
AS		 601{
602 struct usb_hub *hub = usb_get_intfdata(intf);
b41a60ec
AS		 603 struct usb_device *hdev = hub->hdev;
604 int i;
0458d5b4 605
b41a60ec
AS		 606 /* Disconnect all the children */
607 for (i = 0; i < hdev->maxchild; ++i) {
608 if (hdev->children[i])
609 usb_disconnect(&hdev->children[i]);
610 }
7d069b7d 611 hub_quiesce(hub);
f07600cf 612 return 0;
7d069b7d
AS		 613}
614
615/* caller has locked the hub device */
f07600cf 616static int hub_post_reset(struct usb_interface *intf)
7d069b7d 617{
7de18d8b
AS		 618 struct usb_hub *hub = usb_get_intfdata(intf);
619
7d069b7d 620 hub_power_on(hub);
0458d5b4 621 hub_activate(hub);
f07600cf 622 return 0;
7d069b7d
AS		 623}
624
1da177e4
LT		 625static int hub_configure(struct usb_hub *hub,
626 struct usb_endpoint_descriptor *endpoint)
627{
628 struct usb_device *hdev = hub->hdev;
629 struct device *hub_dev = hub->intfdev;
630 u16 hubstatus, hubchange;
74ad9bd2 631 u16 wHubCharacteristics;
1da177e4
LT		 632 unsigned int pipe;
633 int maxp, ret;
634 char *message;
635
636 hub->buffer = usb_buffer_alloc(hdev, sizeof(*hub->buffer), GFP_KERNEL,
637 &hub->buffer_dma);
638 if (!hub->buffer) {
639 message = "can't allocate hub irq buffer";
640 ret = -ENOMEM;
641 goto fail;
642 }
643
644 hub->status = kmalloc(sizeof(*hub->status), GFP_KERNEL);
645 if (!hub->status) {
646 message = "can't kmalloc hub status buffer";
647 ret = -ENOMEM;
648 goto fail;
649 }
db90e7a1 650 mutex_init(&hub->status_mutex);
1da177e4
LT		 651
652 hub->descriptor = kmalloc(sizeof(*hub->descriptor), GFP_KERNEL);
653 if (!hub->descriptor) {
654 message = "can't kmalloc hub descriptor";
655 ret = -ENOMEM;
656 goto fail;
657 }
658
659 /* Request the entire hub descriptor.
660 * hub->descriptor can handle USB_MAXCHILDREN ports,
661 * but the hub can/will return fewer bytes here.
662 */
663 ret = get_hub_descriptor(hdev, hub->descriptor,
664 sizeof(*hub->descriptor));
665 if (ret < 0) {
666 message = "can't read hub descriptor";
667 goto fail;
668 } else if (hub->descriptor->bNbrPorts > USB_MAXCHILDREN) {
669 message = "hub has too many ports!";
670 ret = -ENODEV;
671 goto fail;
672 }
673
674 hdev->maxchild = hub->descriptor->bNbrPorts;
675 dev_info (hub_dev, "%d port%s detected\n", hdev->maxchild,
676 (hdev->maxchild == 1) ? "" : "s");
677
74ad9bd2 678 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4 679
74ad9bd2 680 if (wHubCharacteristics & HUB_CHAR_COMPOUND) {
1da177e4
LT		 681 int i;
682 char portstr [USB_MAXCHILDREN + 1];
683
684 for (i = 0; i < hdev->maxchild; i++)
685 portstr[i] = hub->descriptor->DeviceRemovable
686 [((i + 1) / 8)] & (1 << ((i + 1) % 8))
687 ? 'F' : 'R';
688 portstr[hdev->maxchild] = 0;
689 dev_dbg(hub_dev, "compound device; port removable status: %s\n", portstr);
690 } else
691 dev_dbg(hub_dev, "standalone hub\n");
692
74ad9bd2 693 switch (wHubCharacteristics & HUB_CHAR_LPSM) {
1da177e4
LT		 694 case 0x00:
695 dev_dbg(hub_dev, "ganged power switching\n");
696 break;
697 case 0x01:
698 dev_dbg(hub_dev, "individual port power switching\n");
699 break;
700 case 0x02:
701 case 0x03:
702 dev_dbg(hub_dev, "no power switching (usb 1.0)\n");
703 break;
704 }
705
74ad9bd2 706 switch (wHubCharacteristics & HUB_CHAR_OCPM) {
1da177e4
LT		 707 case 0x00:
708 dev_dbg(hub_dev, "global over-current protection\n");
709 break;
710 case 0x08:
711 dev_dbg(hub_dev, "individual port over-current protection\n");
712 break;
713 case 0x10:
714 case 0x18:
715 dev_dbg(hub_dev, "no over-current protection\n");
716 break;
717 }
718
719 spin_lock_init (&hub->tt.lock);
720 INIT_LIST_HEAD (&hub->tt.clear_list);
c4028958 721 INIT_WORK (&hub->tt.kevent, hub_tt_kevent);
1da177e4
LT		 722 switch (hdev->descriptor.bDeviceProtocol) {
723 case 0:
724 break;
725 case 1:
726 dev_dbg(hub_dev, "Single TT\n");
727 hub->tt.hub = hdev;
728 break;
729 case 2:
730 ret = usb_set_interface(hdev, 0, 1);
731 if (ret == 0) {
732 dev_dbg(hub_dev, "TT per port\n");
733 hub->tt.multi = 1;
734 } else
735 dev_err(hub_dev, "Using single TT (err %d)\n",
736 ret);
737 hub->tt.hub = hdev;
738 break;
739 default:
740 dev_dbg(hub_dev, "Unrecognized hub protocol %d\n",
741 hdev->descriptor.bDeviceProtocol);
742 break;
743 }
744
e09711ae 745 /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
74ad9bd2 746 switch (wHubCharacteristics & HUB_CHAR_TTTT) {
e09711ae
DB		 747 case HUB_TTTT_8_BITS:
748 if (hdev->descriptor.bDeviceProtocol != 0) {
749 hub->tt.think_time = 666;
750 dev_dbg(hub_dev, "TT requires at most %d "
751 "FS bit times (%d ns)\n",
752 8, hub->tt.think_time);
753 }
1da177e4 754 break;
e09711ae
DB		 755 case HUB_TTTT_16_BITS:
756 hub->tt.think_time = 666 * 2;
757 dev_dbg(hub_dev, "TT requires at most %d "
758 "FS bit times (%d ns)\n",
759 16, hub->tt.think_time);
1da177e4 760 break;
e09711ae
DB		 761 case HUB_TTTT_24_BITS:
762 hub->tt.think_time = 666 * 3;
763 dev_dbg(hub_dev, "TT requires at most %d "
764 "FS bit times (%d ns)\n",
765 24, hub->tt.think_time);
1da177e4 766 break;
e09711ae
DB		 767 case HUB_TTTT_32_BITS:
768 hub->tt.think_time = 666 * 4;
769 dev_dbg(hub_dev, "TT requires at most %d "
770 "FS bit times (%d ns)\n",
771 32, hub->tt.think_time);
1da177e4
LT		 772 break;
773 }
774
775 /* probe() zeroes hub->indicator[] */
74ad9bd2 776 if (wHubCharacteristics & HUB_CHAR_PORTIND) {
1da177e4
LT		 777 hub->has_indicators = 1;
778 dev_dbg(hub_dev, "Port indicators are supported\n");
779 }
780
781 dev_dbg(hub_dev, "power on to power good time: %dms\n",
782 hub->descriptor->bPwrOn2PwrGood * 2);
783
784 /* power budgeting mostly matters with bus-powered hubs,
785 * and battery-powered root hubs (may provide just 8 mA).
786 */
787 ret = usb_get_status(hdev, USB_RECIP_DEVICE, 0, &hubstatus);
55c52718 788 if (ret < 2) {
1da177e4
LT		 789 message = "can't get hub status";
790 goto fail;
791 }
7d35b929
AS		 792 le16_to_cpus(&hubstatus);
793 if (hdev == hdev->bus->root_hub) {
55c52718
AS		 794 if (hdev->bus_mA == 0 || hdev->bus_mA >= 500)
795 hub->mA_per_port = 500;
796 else {
797 hub->mA_per_port = hdev->bus_mA;
798 hub->limited_power = 1;
799 }
7d35b929 800 } else if ((hubstatus & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
1da177e4
LT		 801 dev_dbg(hub_dev, "hub controller current requirement: %dmA\n",
802 hub->descriptor->bHubContrCurrent);
55c52718
AS		 803 hub->limited_power = 1;
804 if (hdev->maxchild > 0) {
805 int remaining = hdev->bus_mA -
806 hub->descriptor->bHubContrCurrent;
807
808 if (remaining < hdev->maxchild * 100)
809 dev_warn(hub_dev,
810 "insufficient power available "
811 "to use all downstream ports\n");
812 hub->mA_per_port = 100; /* 7.2.1.1 */
813 }
814 } else { /* Self-powered external hub */
815 /* FIXME: What about battery-powered external hubs that
816 * provide less current per port? */
817 hub->mA_per_port = 500;
7d35b929 818 }
55c52718
AS		 819 if (hub->mA_per_port < 500)
820 dev_dbg(hub_dev, "%umA bus power budget for each child\n",
821 hub->mA_per_port);
1da177e4
LT		 822
823 ret = hub_hub_status(hub, &hubstatus, &hubchange);
824 if (ret < 0) {
825 message = "can't get hub status";
826 goto fail;
827 }
828
829 /* local power status reports aren't always correct */
830 if (hdev->actconfig->desc.bmAttributes & USB_CONFIG_ATT_SELFPOWER)
831 dev_dbg(hub_dev, "local power source is %s\n",
832 (hubstatus & HUB_STATUS_LOCAL_POWER)
833 ? "lost (inactive)" : "good");
834
74ad9bd2 835 if ((wHubCharacteristics & HUB_CHAR_OCPM) == 0)
1da177e4
LT		 836 dev_dbg(hub_dev, "%sover-current condition exists\n",
837 (hubstatus & HUB_STATUS_OVERCURRENT) ? "" : "no ");
838
88fafff9 839 /* set up the interrupt endpoint
840 * We use the EP's maxpacket size instead of (PORTS+1+7)/8
841 * bytes as USB2.0[11.12.3] says because some hubs are known
842 * to send more data (and thus cause overflow). For root hubs,
843 * maxpktsize is defined in hcd.c's fake endpoint descriptors
844 * to be big enough for at least USB_MAXCHILDREN ports. */
1da177e4
LT		 845 pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
846 maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
847
848 if (maxp > sizeof(*hub->buffer))
849 maxp = sizeof(*hub->buffer);
850
851 hub->urb = usb_alloc_urb(0, GFP_KERNEL);
852 if (!hub->urb) {
853 message = "couldn't allocate interrupt urb";
854 ret = -ENOMEM;
855 goto fail;
856 }
857
858 usb_fill_int_urb(hub->urb, hdev, pipe, *hub->buffer, maxp, hub_irq,
859 hub, endpoint->bInterval);
860 hub->urb->transfer_dma = hub->buffer_dma;
861 hub->urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
862
863 /* maybe cycle the hub leds */
864 if (hub->has_indicators && blinkenlights)
865 hub->indicator [0] = INDICATOR_CYCLE;
866
867 hub_power_on(hub);
868 hub_activate(hub);
869 return 0;
870
871fail:
872 dev_err (hub_dev, "config failed, %s (err %d)\n",
873 message, ret);
874 /* hub_disconnect() frees urb and descriptor */
875 return ret;
876}
877
e8054854
AS		 878static void hub_release(struct kref *kref)
879{
880 struct usb_hub *hub = container_of(kref, struct usb_hub, kref);
881
882 usb_put_intf(to_usb_interface(hub->intfdev));
883 kfree(hub);
884}
885
1da177e4
LT		 886static unsigned highspeed_hubs;
887
888static void hub_disconnect(struct usb_interface *intf)
889{
890 struct usb_hub *hub = usb_get_intfdata (intf);
e8054854
AS		 891
892 /* Take the hub off the event list and don't let it be added again */
893 spin_lock_irq(&hub_event_lock);
894 list_del_init(&hub->event_list);
895 hub->disconnected = 1;
896 spin_unlock_irq(&hub_event_lock);
1da177e4 897
7de18d8b
AS		 898 /* Disconnect all children and quiesce the hub */
899 hub->error = 0;
900 hub_pre_reset(intf);
901
8b28c752 902 usb_set_intfdata (intf, NULL);
1da177e4 903
e8054854 904 if (hub->hdev->speed == USB_SPEED_HIGH)
1da177e4
LT		 905 highspeed_hubs--;
906
1da177e4 907 usb_free_urb(hub->urb);
1bc3c9e1 908 kfree(hub->descriptor);
1bc3c9e1 909 kfree(hub->status);
e8054854
AS		 910 usb_buffer_free(hub->hdev, sizeof(*hub->buffer), hub->buffer,
911 hub->buffer_dma);
1da177e4 912
e8054854 913 kref_put(&hub->kref, hub_release);
1da177e4
LT		 914}
915
916static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
917{
918 struct usb_host_interface *desc;
919 struct usb_endpoint_descriptor *endpoint;
920 struct usb_device *hdev;
921 struct usb_hub *hub;
922
923 desc = intf->cur_altsetting;
924 hdev = interface_to_usbdev(intf);
925
89ccbdc9
DB		 926#ifdef CONFIG_USB_OTG_BLACKLIST_HUB
927 if (hdev->parent) {
928 dev_warn(&intf->dev, "ignoring external hub\n");
929 return -ENODEV;
930 }
931#endif
932
1da177e4
LT		 933 /* Some hubs have a subclass of 1, which AFAICT according to the */
934 /* specs is not defined, but it works */
935 if ((desc->desc.bInterfaceSubClass != 0) &&
936 (desc->desc.bInterfaceSubClass != 1)) {
937descriptor_error:
938 dev_err (&intf->dev, "bad descriptor, ignoring hub\n");
939 return -EIO;
940 }
941
942 /* Multiple endpoints? What kind of mutant ninja-hub is this? */
943 if (desc->desc.bNumEndpoints != 1)
944 goto descriptor_error;
945
946 endpoint = &desc->endpoint[0].desc;
947
fbf81c29
LFC		 948 /* If it's not an interrupt in endpoint, we'd better punt! */
949 if (!usb_endpoint_is_int_in(endpoint))
1da177e4
LT		 950 goto descriptor_error;
951
952 /* We found a hub */
953 dev_info (&intf->dev, "USB hub found\n");
954
0a1ef3b5 955 hub = kzalloc(sizeof(*hub), GFP_KERNEL);
1da177e4
LT		 956 if (!hub) {
957 dev_dbg (&intf->dev, "couldn't kmalloc hub struct\n");
958 return -ENOMEM;
959 }
960
e8054854 961 kref_init(&hub->kref);
1da177e4
LT		 962 INIT_LIST_HEAD(&hub->event_list);
963 hub->intfdev = &intf->dev;
964 hub->hdev = hdev;
c4028958 965 INIT_DELAYED_WORK(&hub->leds, led_work);
e8054854 966 usb_get_intf(intf);
1da177e4
LT		 967
968 usb_set_intfdata (intf, hub);
40f122f3 969 intf->needs_remote_wakeup = 1;
1da177e4
LT		 970
971 if (hdev->speed == USB_SPEED_HIGH)
972 highspeed_hubs++;
973
974 if (hub_configure(hub, endpoint) >= 0)
975 return 0;
976
977 hub_disconnect (intf);
978 return -ENODEV;
979}
980
981static int
982hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
983{
984 struct usb_device *hdev = interface_to_usbdev (intf);
985
986 /* assert ifno == 0 (part of hub spec) */
987 switch (code) {
988 case USBDEVFS_HUB_PORTINFO: {
989 struct usbdevfs_hub_portinfo *info = user_data;
990 int i;
991
992 spin_lock_irq(&device_state_lock);
993 if (hdev->devnum <= 0)
994 info->nports = 0;
995 else {
996 info->nports = hdev->maxchild;
997 for (i = 0; i < info->nports; i++) {
998 if (hdev->children[i] == NULL)
999 info->port[i] = 0;
1000 else
1001 info->port[i] =
1002 hdev->children[i]->devnum;
1003 }
1004 }
1005 spin_unlock_irq(&device_state_lock);
1006
1007 return info->nports + 1;
1008 }
1009
1010 default:
1011 return -ENOSYS;
1012 }
1013}
1014
1da177e4 1015
1da177e4
LT		 1016static void recursively_mark_NOTATTACHED(struct usb_device *udev)
1017{
1018 int i;
1019
1020 for (i = 0; i < udev->maxchild; ++i) {
1021 if (udev->children[i])
1022 recursively_mark_NOTATTACHED(udev->children[i]);
1023 }
ee49fb5d
AS		 1024 if (udev->state == USB_STATE_SUSPENDED)
1025 udev->discon_suspended = 1;
1da177e4
LT		 1026 udev->state = USB_STATE_NOTATTACHED;
1027}
1028
1029/**
1030 * usb_set_device_state - change a device's current state (usbcore, hcds)
1031 * @udev: pointer to device whose state should be changed
1032 * @new_state: new state value to be stored
1033 *
1034 * udev->state is _not_ fully protected by the device lock. Although
1035 * most transitions are made only while holding the lock, the state can
1036 * can change to USB_STATE_NOTATTACHED at almost any time. This
1037 * is so that devices can be marked as disconnected as soon as possible,
1038 * without having to wait for any semaphores to be released. As a result,
1039 * all changes to any device's state must be protected by the
1040 * device_state_lock spinlock.
1041 *
1042 * Once a device has been added to the device tree, all changes to its state
1043 * should be made using this routine. The state should _not_ be set directly.
1044 *
1045 * If udev->state is already USB_STATE_NOTATTACHED then no change is made.
1046 * Otherwise udev->state is set to new_state, and if new_state is
1047 * USB_STATE_NOTATTACHED then all of udev's descendants' states are also set
1048 * to USB_STATE_NOTATTACHED.
1049 */
1050void usb_set_device_state(struct usb_device *udev,
1051 enum usb_device_state new_state)
1052{
1053 unsigned long flags;
1054
1055 spin_lock_irqsave(&device_state_lock, flags);
1056 if (udev->state == USB_STATE_NOTATTACHED)
1057 ; /* do nothing */
b94dc6b5 1058 else if (new_state != USB_STATE_NOTATTACHED) {
fb669cc0
DB		 1059
1060 /* root hub wakeup capabilities are managed out-of-band
1061 * and may involve silicon errata ... ignore them here.
1062 */
1063 if (udev->parent) {
645daaab
AS		 1064 if (udev->state == USB_STATE_SUSPENDED
1065 || new_state == USB_STATE_SUSPENDED)
1066 ; /* No change to wakeup settings */
1067 else if (new_state == USB_STATE_CONFIGURED)
fb669cc0
DB		 1068 device_init_wakeup(&udev->dev,
1069 (udev->actconfig->desc.bmAttributes
1070 & USB_CONFIG_ATT_WAKEUP));
645daaab 1071 else
fb669cc0
DB		 1072 device_init_wakeup(&udev->dev, 0);
1073 }
645daaab 1074 udev->state = new_state;
b94dc6b5 1075 } else
1da177e4
LT		 1076 recursively_mark_NOTATTACHED(udev);
1077 spin_unlock_irqrestore(&device_state_lock, flags);
1078}
1da177e4 1079
1da177e4
LT		 1080static void choose_address(struct usb_device *udev)
1081{
1082 int devnum;
1083 struct usb_bus *bus = udev->bus;
1084
1085 /* If khubd ever becomes multithreaded, this will need a lock */
1086
1087 /* Try to allocate the next devnum beginning at bus->devnum_next. */
1088 devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
1089 bus->devnum_next);
1090 if (devnum >= 128)
1091 devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
1092
1093 bus->devnum_next = ( devnum >= 127 ? 1 : devnum + 1);
1094
1095 if (devnum < 128) {
1096 set_bit(devnum, bus->devmap.devicemap);
1097 udev->devnum = devnum;
1098 }
1099}
1100
1101static void release_address(struct usb_device *udev)
1102{
1103 if (udev->devnum > 0) {
1104 clear_bit(udev->devnum, udev->bus->devmap.devicemap);
1105 udev->devnum = -1;
1106 }
1107}
1108
d5d4db70
AS		 1109#ifdef CONFIG_USB_SUSPEND
1110
1111static void usb_stop_pm(struct usb_device *udev)
1112{
1113 /* Synchronize with the ksuspend thread to prevent any more
1114 * autosuspend requests from being submitted, and decrement
1115 * the parent's count of unsuspended children.
1116 */
1117 usb_pm_lock(udev);
1118 if (udev->parent && !udev->discon_suspended)
1119 usb_autosuspend_device(udev->parent);
1120 usb_pm_unlock(udev);
1121
1122 /* Stop any autosuspend requests already submitted */
1123 cancel_rearming_delayed_work(&udev->autosuspend);
1124}
1125
1126#else
1127
1128static inline void usb_stop_pm(struct usb_device *udev)
1129{ }
1130
1131#endif
1132
1da177e4
LT		 1133/**
1134 * usb_disconnect - disconnect a device (usbcore-internal)
1135 * @pdev: pointer to device being disconnected
1136 * Context: !in_interrupt ()
1137 *
1138 * Something got disconnected. Get rid of it and all of its children.
1139 *
1140 * If *pdev is a normal device then the parent hub must already be locked.
1141 * If *pdev is a root hub then this routine will acquire the
1142 * usb_bus_list_lock on behalf of the caller.
1143 *
1144 * Only hub drivers (including virtual root hub drivers for host
1145 * controllers) should ever call this.
1146 *
1147 * This call is synchronous, and may not be used in an interrupt context.
1148 */
1149void usb_disconnect(struct usb_device **pdev)
1150{
1151 struct usb_device *udev = *pdev;
1152 int i;
1153
1154 if (!udev) {
1155 pr_debug ("%s nodev\n", __FUNCTION__);
1156 return;
1157 }
1158
1159 /* mark the device as inactive, so any further urb submissions for
1160 * this device (and any of its children) will fail immediately.
1161 * this quiesces everyting except pending urbs.
1162 */
1163 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
1da177e4
LT		 1164 dev_info (&udev->dev, "USB disconnect, address %d\n", udev->devnum);
1165
9ad3d6cc
AS		 1166 usb_lock_device(udev);
1167
1da177e4
LT		 1168 /* Free up all the children before we remove this device */
1169 for (i = 0; i < USB_MAXCHILDREN; i++) {
1170 if (udev->children[i])
1171 usb_disconnect(&udev->children[i]);
1172 }
1173
1174 /* deallocate hcd/hardware state ... nuking all pending urbs and
1175 * cleaning up all state associated with the current configuration
1176 * so that the hardware is now fully quiesced.
1177 */
782da727 1178 dev_dbg (&udev->dev, "unregistering device\n");
1da177e4
LT		 1179 usb_disable_device(udev, 0);
1180
782da727
AS		 1181 usb_unlock_device(udev);
1182
1183 /* Unregister the device. The device driver is responsible
1184 * for removing the device files from usbfs and sysfs and for
1185 * de-configuring the device.
1186 */
1187 device_del(&udev->dev);
3099e75a 1188
782da727 1189 /* Free the device number and delete the parent's children[]
1da177e4
LT		 1190 * (or root_hub) pointer.
1191 */
1da177e4 1192 release_address(udev);
1da177e4
LT		 1193
1194 /* Avoid races with recursively_mark_NOTATTACHED() */
1195 spin_lock_irq(&device_state_lock);
1196 *pdev = NULL;
1197 spin_unlock_irq(&device_state_lock);
1198
d5d4db70 1199 usb_stop_pm(udev);
ee49fb5d 1200
782da727 1201 put_device(&udev->dev);
1da177e4
LT		 1202}
1203
1204#ifdef DEBUG
1205static void show_string(struct usb_device *udev, char *id, char *string)
1206{
1207 if (!string)
1208 return;
1209 dev_printk(KERN_INFO, &udev->dev, "%s: %s\n", id, string);
1210}
1211
1212#else
1213static inline void show_string(struct usb_device *udev, char *id, char *string)
1214{}
1215#endif
1216
1da177e4
LT		 1217
1218#ifdef CONFIG_USB_OTG
1219#include "otg_whitelist.h"
1220#endif
1221
3ede760f 1222/**
d9d16e8a 1223 * usb_configure_device_otg - FIXME (usbcore-internal)
3ede760f
ON		 1224 * @udev: newly addressed device (in ADDRESS state)
1225 *
d9d16e8a 1226 * Do configuration for On-The-Go devices
3ede760f 1227 */
d9d16e8a 1228static int usb_configure_device_otg(struct usb_device *udev)
1da177e4 1229{
d9d16e8a 1230 int err = 0;
1da177e4
LT		 1231
1232#ifdef CONFIG_USB_OTG
1233 /*
1234 * OTG-aware devices on OTG-capable root hubs may be able to use SRP,
1235 * to wake us after we've powered off VBUS; and HNP, switching roles
1236 * "host" to "peripheral". The OTG descriptor helps figure this out.
1237 */
1238 if (!udev->bus->is_b_host
1239 && udev->config
1240 && udev->parent == udev->bus->root_hub) {
1241 struct usb_otg_descriptor *desc = 0;
1242 struct usb_bus *bus = udev->bus;
1243
1244 /* descriptor may appear anywhere in config */
1245 if (__usb_get_extra_descriptor (udev->rawdescriptors[0],
1246 le16_to_cpu(udev->config[0].desc.wTotalLength),
1247 USB_DT_OTG, (void **) &desc) == 0) {
1248 if (desc->bmAttributes & USB_OTG_HNP) {
12c3da34 1249 unsigned port1 = udev->portnum;
fc849b85 1250
1da177e4
LT		 1251 dev_info(&udev->dev,
1252 "Dual-Role OTG device on %sHNP port\n",
1253 (port1 == bus->otg_port)
1254 ? "" : "non-");
1255
1256 /* enable HNP before suspend, it's simpler */
1257 if (port1 == bus->otg_port)
1258 bus->b_hnp_enable = 1;
1259 err = usb_control_msg(udev,
1260 usb_sndctrlpipe(udev, 0),
1261 USB_REQ_SET_FEATURE, 0,
1262 bus->b_hnp_enable
1263 ? USB_DEVICE_B_HNP_ENABLE
1264 : USB_DEVICE_A_ALT_HNP_SUPPORT,
1265 0, NULL, 0, USB_CTRL_SET_TIMEOUT);
1266 if (err < 0) {
1267 /* OTG MESSAGE: report errors here,
1268 * customize to match your product.
1269 */
1270 dev_info(&udev->dev,
1271 "can't set HNP mode; %d\n",
1272 err);
1273 bus->b_hnp_enable = 0;
1274 }
1275 }
1276 }
1277 }
1278
1279 if (!is_targeted(udev)) {
1280
1281 /* Maybe it can talk to us, though we can't talk to it.
1282 * (Includes HNP test device.)
1283 */
1284 if (udev->bus->b_hnp_enable || udev->bus->is_b_host) {
4956eccd 1285 err = usb_port_suspend(udev);
1da177e4
LT		 1286 if (err < 0)
1287 dev_dbg(&udev->dev, "HNP fail, %d\n", err);
1288 }
ffcdc18d 1289 err = -ENOTSUPP;
1da177e4
LT		 1290 goto fail;
1291 }
d9d16e8a 1292fail:
1da177e4 1293#endif
d9d16e8a
IPG		 1294 return err;
1295}
1296
1297
1298/**
1299 * usb_configure_device - Detect and probe device intfs/otg (usbcore-internal)
1300 * @udev: newly addressed device (in ADDRESS state)
1301 *
1302 * This is only called by usb_new_device() and usb_authorize_device()
1303 * and FIXME -- all comments that apply to them apply here wrt to
1304 * environment.
1305 *
1306 * If the device is WUSB and not authorized, we don't attempt to read
1307 * the string descriptors, as they will be errored out by the device
1308 * until it has been authorized.
1309 */
1310static int usb_configure_device(struct usb_device *udev)
1311{
1312 int err;
1da177e4 1313
d9d16e8a
IPG		 1314 if (udev->config == NULL) {
1315 err = usb_get_configuration(udev);
1316 if (err < 0) {
1317 dev_err(&udev->dev, "can't read configurations, error %d\n",
1318 err);
1319 goto fail;
1320 }
1321 }
1322 if (udev->wusb == 1 && udev->authorized == 0) {
1323 udev->product = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1324 udev->manufacturer = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1325 udev->serial = kstrdup("n/a (unauthorized)", GFP_KERNEL);
1326 }
1327 else {
1328 /* read the standard strings and cache them if present */
1329 udev->product = usb_cache_string(udev, udev->descriptor.iProduct);
1330 udev->manufacturer = usb_cache_string(udev,
1331 udev->descriptor.iManufacturer);
1332 udev->serial = usb_cache_string(udev, udev->descriptor.iSerialNumber);
1333 }
1334 err = usb_configure_device_otg(udev);
1335fail:
1336 return err;
1337}
1338
1339
1340/**
1341 * usb_new_device - perform initial device setup (usbcore-internal)
1342 * @udev: newly addressed device (in ADDRESS state)
1343 *
1344 * This is called with devices which have been enumerated, but not yet
1345 * configured. The device descriptor is available, but not descriptors
1346 * for any device configuration. The caller must have locked either
1347 * the parent hub (if udev is a normal device) or else the
1348 * usb_bus_list_lock (if udev is a root hub). The parent's pointer to
1349 * udev has already been installed, but udev is not yet visible through
1350 * sysfs or other filesystem code.
1351 *
1352 * It will return if the device is configured properly or not. Zero if
1353 * the interface was registered with the driver core; else a negative
1354 * errno value.
1355 *
1356 * This call is synchronous, and may not be used in an interrupt context.
1357 *
1358 * Only the hub driver or root-hub registrar should ever call this.
1359 */
1360int usb_new_device(struct usb_device *udev)
1361{
1362 int err;
1363
1364 usb_detect_quirks(udev); /* Determine quirks */
1365 err = usb_configure_device(udev); /* detect & probe dev/intfs */
1366 if (err < 0)
1367 goto fail;
9f8b17e6
KS		 1368 /* export the usbdev device-node for libusb */
1369 udev->dev.devt = MKDEV(USB_DEVICE_MAJOR,
1370 (((udev->bus->busnum-1) * 128) + (udev->devnum-1)));
1371
195af2cc
AS		 1372 /* Increment the parent's count of unsuspended children */
1373 if (udev->parent)
1374 usb_autoresume_device(udev->parent);
1375
782da727 1376 /* Register the device. The device driver is responsible
9f8b17e6
KS		 1377 * for adding the device files to sysfs and for configuring
1378 * the device.
782da727 1379 */
9f8b17e6 1380 err = device_add(&udev->dev);
1da177e4
LT		 1381 if (err) {
1382 dev_err(&udev->dev, "can't device_add, error %d\n", err);
1383 goto fail;
1384 }
9ad3d6cc 1385
d9d16e8a
IPG		 1386 /* Tell the world! */
1387 dev_dbg(&udev->dev, "new device strings: Mfr=%d, Product=%d, "
1388 "SerialNumber=%d\n",
1389 udev->descriptor.iManufacturer,
1390 udev->descriptor.iProduct,
1391 udev->descriptor.iSerialNumber);
1392 show_string(udev, "Product", udev->product);
1393 show_string(udev, "Manufacturer", udev->manufacturer);
1394 show_string(udev, "SerialNumber", udev->serial);
c066475e 1395 return err;
1da177e4
LT		 1396
1397fail:
1398 usb_set_device_state(udev, USB_STATE_NOTATTACHED);
d9d16e8a 1399 return err;
1da177e4
LT		 1400}
1401
1da177e4
LT		 1402static int hub_port_status(struct usb_hub *hub, int port1,
1403 u16 *status, u16 *change)
1404{
1405 int ret;
1406
db90e7a1 1407 mutex_lock(&hub->status_mutex);
1da177e4 1408 ret = get_port_status(hub->hdev, port1, &hub->status->port);
d25450c6 1409 if (ret < 4) {
1da177e4
LT		 1410 dev_err (hub->intfdev,
1411 "%s failed (err = %d)\n", __FUNCTION__, ret);
d25450c6
AS		 1412 if (ret >= 0)
1413 ret = -EIO;
1414 } else {
1da177e4
LT		 1415 *status = le16_to_cpu(hub->status->port.wPortStatus);
1416 *change = le16_to_cpu(hub->status->port.wPortChange);
1417 ret = 0;
1418 }
db90e7a1 1419 mutex_unlock(&hub->status_mutex);
1da177e4
LT		 1420 return ret;
1421}
1422
0165de09
IPG		 1423
1424/* Returns 1 if @hub is a WUSB root hub, 0 otherwise */
1425static unsigned hub_is_wusb(struct usb_hub *hub)
1426{
1427 struct usb_hcd *hcd;
1428 if (hub->hdev->parent != NULL) /* not a root hub? */
1429 return 0;
1430 hcd = container_of(hub->hdev->bus, struct usb_hcd, self);
1431 return hcd->wireless;
1432}
1433
1434
1da177e4
LT		 1435#define PORT_RESET_TRIES 5
1436#define SET_ADDRESS_TRIES 2
1437#define GET_DESCRIPTOR_TRIES 2
1438#define SET_CONFIG_TRIES (2 * (use_both_schemes + 1))
1439#define USE_NEW_SCHEME(i) ((i) / 2 == old_scheme_first)
1440
1441#define HUB_ROOT_RESET_TIME 50 /* times are in msec */
1442#define HUB_SHORT_RESET_TIME 10
1443#define HUB_LONG_RESET_TIME 200
1444#define HUB_RESET_TIMEOUT 500
1445
1446static int hub_port_wait_reset(struct usb_hub *hub, int port1,
1447 struct usb_device *udev, unsigned int delay)
1448{
1449 int delay_time, ret;
1450 u16 portstatus;
1451 u16 portchange;
1452
1453 for (delay_time = 0;
1454 delay_time < HUB_RESET_TIMEOUT;
1455 delay_time += delay) {
1456 /* wait to give the device a chance to reset */
1457 msleep(delay);
1458
1459 /* read and decode port status */
1460 ret = hub_port_status(hub, port1, &portstatus, &portchange);
1461 if (ret < 0)
1462 return ret;
1463
1464 /* Device went away? */
1465 if (!(portstatus & USB_PORT_STAT_CONNECTION))
1466 return -ENOTCONN;
1467
dd4dd19e 1468 /* bomb out completely if the connection bounced */
1da177e4 1469 if ((portchange & USB_PORT_STAT_C_CONNECTION))
dd4dd19e 1470 return -ENOTCONN;
1da177e4
LT		 1471
1472 /* if we`ve finished resetting, then break out of the loop */
1473 if (!(portstatus & USB_PORT_STAT_RESET) &&
1474 (portstatus & USB_PORT_STAT_ENABLE)) {
0165de09
IPG		 1475 if (hub_is_wusb(hub))
1476 udev->speed = USB_SPEED_VARIABLE;
1477 else if (portstatus & USB_PORT_STAT_HIGH_SPEED)
1da177e4
LT		 1478 udev->speed = USB_SPEED_HIGH;
1479 else if (portstatus & USB_PORT_STAT_LOW_SPEED)
1480 udev->speed = USB_SPEED_LOW;
1481 else
1482 udev->speed = USB_SPEED_FULL;
1483 return 0;
1484 }
1485
1486 /* switch to the long delay after two short delay failures */
1487 if (delay_time >= 2 * HUB_SHORT_RESET_TIME)
1488 delay = HUB_LONG_RESET_TIME;
1489
1490 dev_dbg (hub->intfdev,
1491 "port %d not reset yet, waiting %dms\n",
1492 port1, delay);
1493 }
1494
1495 return -EBUSY;
1496}
1497
1498static int hub_port_reset(struct usb_hub *hub, int port1,
1499 struct usb_device *udev, unsigned int delay)
1500{
1501 int i, status;
1502
1503 /* Reset the port */
1504 for (i = 0; i < PORT_RESET_TRIES; i++) {
1505 status = set_port_feature(hub->hdev,
1506 port1, USB_PORT_FEAT_RESET);
1507 if (status)
1508 dev_err(hub->intfdev,
1509 "cannot reset port %d (err = %d)\n",
1510 port1, status);
1511 else {
1512 status = hub_port_wait_reset(hub, port1, udev, delay);
dd16525b 1513 if (status && status != -ENOTCONN)
1da177e4
LT		 1514 dev_dbg(hub->intfdev,
1515 "port_wait_reset: err = %d\n",
1516 status);
1517 }
1518
1519 /* return on disconnect or reset */
1520 switch (status) {
1521 case 0:
b789696a
DB		 1522 /* TRSTRCY = 10 ms; plus some extra */
1523 msleep(10 + 40);
4326ed0b 1524 udev->devnum = 0; /* Device now at address 0 */
1da177e4
LT		 1525 /* FALL THROUGH */
1526 case -ENOTCONN:
1527 case -ENODEV:
1528 clear_port_feature(hub->hdev,
1529 port1, USB_PORT_FEAT_C_RESET);
1530 /* FIXME need disconnect() for NOTATTACHED device */
1531 usb_set_device_state(udev, status
1532 ? USB_STATE_NOTATTACHED
1533 : USB_STATE_DEFAULT);
1534 return status;
1535 }
1536
1537 dev_dbg (hub->intfdev,
1538 "port %d not enabled, trying reset again...\n",
1539 port1);
1540 delay = HUB_LONG_RESET_TIME;
1541 }
1542
1543 dev_err (hub->intfdev,
1544 "Cannot enable port %i. Maybe the USB cable is bad?\n",
1545 port1);
1546
1547 return status;
1548}
1549
d388dab7 1550#ifdef CONFIG_PM
1da177e4
LT		 1551
1552#ifdef CONFIG_USB_SUSPEND
1553
1554/*
624d6c07
AS		 1555 * usb_port_suspend - suspend a usb device's upstream port
1556 * @udev: device that's no longer in active use, not a root hub
1557 * Context: must be able to sleep; device not locked; pm locks held
1558 *
1559 * Suspends a USB device that isn't in active use, conserving power.
1560 * Devices may wake out of a suspend, if anything important happens,
1561 * using the remote wakeup mechanism. They may also be taken out of
1562 * suspend by the host, using usb_port_resume(). It's also routine
1563 * to disconnect devices while they are suspended.
1564 *
1565 * This only affects the USB hardware for a device; its interfaces
1566 * (and, for hubs, child devices) must already have been suspended.
1567 *
1da177e4
LT		 1568 * Selective port suspend reduces power; most suspended devices draw
1569 * less than 500 uA. It's also used in OTG, along with remote wakeup.
1570 * All devices below the suspended port are also suspended.
1571 *
1572 * Devices leave suspend state when the host wakes them up. Some devices
1573 * also support "remote wakeup", where the device can activate the USB
1574 * tree above them to deliver data, such as a keypress or packet. In
1575 * some cases, this wakes the USB host.
624d6c07
AS		 1576 *
1577 * Suspending OTG devices may trigger HNP, if that's been enabled
1578 * between a pair of dual-role devices. That will change roles, such
1579 * as from A-Host to A-Peripheral or from B-Host back to B-Peripheral.
1580 *
1581 * Devices on USB hub ports have only one "suspend" state, corresponding
1582 * to ACPI D2, "may cause the device to lose some context".
1583 * State transitions include:
1584 *
1585 * - suspend, resume ... when the VBUS power link stays live
1586 * - suspend, disconnect ... VBUS lost
1587 *
1588 * Once VBUS drop breaks the circuit, the port it's using has to go through
1589 * normal re-enumeration procedures, starting with enabling VBUS power.
1590 * Other than re-initializing the hub (plug/unplug, except for root hubs),
1591 * Linux (2.6) currently has NO mechanisms to initiate that: no khubd
1592 * timer, no SRP, no requests through sysfs.
1593 *
1594 * If CONFIG_USB_SUSPEND isn't enabled, devices only really suspend when
1595 * the root hub for their bus goes into global suspend ... so we don't
1596 * (falsely) update the device power state to say it suspended.
1597 *
1598 * Returns 0 on success, else negative errno.
1da177e4 1599 */
624d6c07 1600int usb_port_suspend(struct usb_device *udev)
1da177e4 1601{
624d6c07
AS		 1602 struct usb_hub *hub = hdev_to_hub(udev->parent);
1603 int port1 = udev->portnum;
1604 int status;
1da177e4
LT		 1605
1606 // dev_dbg(hub->intfdev, "suspend port %d\n", port1);
1607
1608 /* enable remote wakeup when appropriate; this lets the device
1609 * wake up the upstream hub (including maybe the root hub).
1610 *
1611 * NOTE: OTG devices may issue remote wakeup (or SRP) even when
1612 * we don't explicitly enable it here.
1613 */
645daaab 1614 if (udev->do_remote_wakeup) {
1da177e4
LT		 1615 status = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1616 USB_REQ_SET_FEATURE, USB_RECIP_DEVICE,
1617 USB_DEVICE_REMOTE_WAKEUP, 0,
1618 NULL, 0,
1619 USB_CTRL_SET_TIMEOUT);
1620 if (status)
624d6c07
AS		 1621 dev_dbg(&udev->dev, "won't remote wakeup, status %d\n",
1622 status);
1da177e4
LT		 1623 }
1624
1625 /* see 7.1.7.6 */
1626 status = set_port_feature(hub->hdev, port1, USB_PORT_FEAT_SUSPEND);
1627 if (status) {
624d6c07
AS		 1628 dev_dbg(hub->intfdev, "can't suspend port %d, status %d\n",
1629 port1, status);
1da177e4
LT		 1630 /* paranoia: "should not happen" */
1631 (void) usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
1632 USB_REQ_CLEAR_FEATURE, USB_RECIP_DEVICE,
1633 USB_DEVICE_REMOTE_WAKEUP, 0,
1634 NULL, 0,
1635 USB_CTRL_SET_TIMEOUT);
1636 } else {
1637 /* device has up to 10 msec to fully suspend */
645daaab
AS		 1638 dev_dbg(&udev->dev, "usb %ssuspend\n",
1639 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1640 usb_set_device_state(udev, USB_STATE_SUSPENDED);
1641 msleep(10);
1642 }
1643 return status;
1644}
1645
1da177e4 1646/*
390a8c34
DB		 1647 * If the USB "suspend" state is in use (rather than "global suspend"),
1648 * many devices will be individually taken out of suspend state using
54515fe5 1649 * special "resume" signaling. This routine kicks in shortly after
1da177e4
LT		 1650 * hardware resume signaling is finished, either because of selective
1651 * resume (by host) or remote wakeup (by device) ... now see what changed
1652 * in the tree that's rooted at this device.
54515fe5
AS		 1653 *
1654 * If @udev->reset_resume is set then the device is reset before the
1655 * status check is done.
1da177e4 1656 */
140d8f68 1657static int finish_port_resume(struct usb_device *udev)
1da177e4 1658{
54515fe5 1659 int status = 0;
1da177e4
LT		 1660 u16 devstatus;
1661
1662 /* caller owns the udev device lock */
54515fe5
AS		 1663 dev_dbg(&udev->dev, "finish %sresume\n",
1664 udev->reset_resume ? "reset-" : "");
1da177e4
LT		 1665
1666 /* usb ch9 identifies four variants of SUSPENDED, based on what
1667 * state the device resumes to. Linux currently won't see the
1668 * first two on the host side; they'd be inside hub_port_init()
1669 * during many timeouts, but khubd can't suspend until later.
1670 */
1671 usb_set_device_state(udev, udev->actconfig
1672 ? USB_STATE_CONFIGURED
1673 : USB_STATE_ADDRESS);
1da177e4 1674
54515fe5
AS		 1675 /* 10.5.4.5 says not to reset a suspended port if the attached
1676 * device is enabled for remote wakeup. Hence the reset
1677 * operation is carried out here, after the port has been
1678 * resumed.
1679 */
1680 if (udev->reset_resume)
1681 status = usb_reset_device(udev);
1682
1da177e4
LT		 1683 /* 10.5.4.5 says be sure devices in the tree are still there.
1684 * For now let's assume the device didn't go crazy on resume,
1685 * and device drivers will know about any resume quirks.
1686 */
54515fe5 1687 if (status == 0) {
46dede46 1688 devstatus = 0;
54515fe5
AS		 1689 status = usb_get_status(udev, USB_RECIP_DEVICE, 0, &devstatus);
1690 if (status >= 0)
46dede46 1691 status = (status > 0 ? 0 : -ENODEV);
54515fe5 1692 }
b40b7a90 1693
624d6c07
AS		 1694 if (status) {
1695 dev_dbg(&udev->dev, "gone after usb resume? status %d\n",
1696 status);
1697 } else if (udev->actconfig) {
1da177e4 1698 le16_to_cpus(&devstatus);
686314cf 1699 if (devstatus & (1 << USB_DEVICE_REMOTE_WAKEUP)) {
1da177e4
LT		 1700 status = usb_control_msg(udev,
1701 usb_sndctrlpipe(udev, 0),
1702 USB_REQ_CLEAR_FEATURE,
1703 USB_RECIP_DEVICE,
1704 USB_DEVICE_REMOTE_WAKEUP, 0,
1705 NULL, 0,
1706 USB_CTRL_SET_TIMEOUT);
a8e7c565 1707 if (status)
1da177e4
LT		 1708 dev_dbg(&udev->dev, "disable remote "
1709 "wakeup, status %d\n", status);
4bf0ba86 1710 }
1da177e4 1711 status = 0;
1da177e4
LT		 1712 }
1713 return status;
1714}
1715
624d6c07
AS		 1716/*
1717 * usb_port_resume - re-activate a suspended usb device's upstream port
1718 * @udev: device to re-activate, not a root hub
1719 * Context: must be able to sleep; device not locked; pm locks held
1720 *
1721 * This will re-activate the suspended device, increasing power usage
1722 * while letting drivers communicate again with its endpoints.
1723 * USB resume explicitly guarantees that the power session between
1724 * the host and the device is the same as it was when the device
1725 * suspended.
1726 *
54515fe5
AS		 1727 * If CONFIG_USB_PERSIST and @udev->reset_resume are both set then this
1728 * routine won't check that the port is still enabled. Furthermore,
1729 * if @udev->reset_resume is set then finish_port_resume() above will
1730 * reset @udev. The end result is that a broken power session can be
1731 * recovered and @udev will appear to persist across a loss of VBUS power.
1732 *
1733 * For example, if a host controller doesn't maintain VBUS suspend current
1734 * during a system sleep or is reset when the system wakes up, all the USB
1735 * power sessions below it will be broken. This is especially troublesome
1736 * for mass-storage devices containing mounted filesystems, since the
1737 * device will appear to have disconnected and all the memory mappings
1738 * to it will be lost. Using the USB_PERSIST facility, the device can be
1739 * made to appear as if it had not disconnected.
1740 *
1741 * This facility is inherently dangerous. Although usb_reset_device()
1742 * makes every effort to insure that the same device is present after the
1743 * reset as before, it cannot provide a 100% guarantee. Furthermore it's
1744 * quite possible for a device to remain unaltered but its media to be
1745 * changed. If the user replaces a flash memory card while the system is
1746 * asleep, he will have only himself to blame when the filesystem on the
1747 * new card is corrupted and the system crashes.
1748 *
624d6c07
AS		 1749 * Returns 0 on success, else negative errno.
1750 */
1751int usb_port_resume(struct usb_device *udev)
1da177e4 1752{
624d6c07
AS		 1753 struct usb_hub *hub = hdev_to_hub(udev->parent);
1754 int port1 = udev->portnum;
1755 int status;
1756 u16 portchange, portstatus;
54515fe5 1757 unsigned mask_flags, want_flags;
d25450c6
AS		 1758
1759 /* Skip the initial Clear-Suspend step for a remote wakeup */
1760 status = hub_port_status(hub, port1, &portstatus, &portchange);
1761 if (status == 0 && !(portstatus & USB_PORT_STAT_SUSPEND))
1762 goto SuspendCleared;
1da177e4
LT		 1763
1764 // dev_dbg(hub->intfdev, "resume port %d\n", port1);
1765
d5cbad4b
AS		 1766 set_bit(port1, hub->busy_bits);
1767
1da177e4
LT		 1768 /* see 7.1.7.7; affects power usage, but not budgeting */
1769 status = clear_port_feature(hub->hdev,
1770 port1, USB_PORT_FEAT_SUSPEND);
1771 if (status) {
624d6c07
AS		 1772 dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
1773 port1, status);
1da177e4 1774 } else {
1da177e4 1775 /* drive resume for at least 20 msec */
686314cf
AS		 1776 dev_dbg(&udev->dev, "usb %sresume\n",
1777 udev->auto_pm ? "auto-" : "");
1da177e4
LT		 1778 msleep(25);
1779
1da177e4
LT		 1780 /* Virtual root hubs can trigger on GET_PORT_STATUS to
1781 * stop resume signaling. Then finish the resume
1782 * sequence.
1783 */
d25450c6 1784 status = hub_port_status(hub, port1, &portstatus, &portchange);
54515fe5
AS		 1785
1786 SuspendCleared:
1787 if (USB_PERSIST && udev->reset_resume)
1788 want_flags = USB_PORT_STAT_POWER
1789 | USB_PORT_STAT_CONNECTION;
1790 else
1791 want_flags = USB_PORT_STAT_POWER
1792 | USB_PORT_STAT_CONNECTION
1793 | USB_PORT_STAT_ENABLE;
1794 mask_flags = want_flags | USB_PORT_STAT_SUSPEND;
1795
1796 if (status < 0 || (portstatus & mask_flags) != want_flags) {
1da177e4
LT		 1797 dev_dbg(hub->intfdev,
1798 "port %d status %04x.%04x after resume, %d\n",
d25450c6 1799 port1, portchange, portstatus, status);
20307949
AS		 1800 if (status >= 0)
1801 status = -ENODEV;
1da177e4 1802 } else {
20307949
AS		 1803 if (portchange & USB_PORT_STAT_C_SUSPEND)
1804 clear_port_feature(hub->hdev, port1,
1805 USB_PORT_FEAT_C_SUSPEND);
1da177e4
LT		 1806 /* TRSMRCY = 10 msec */
1807 msleep(10);
1da177e4
LT		 1808 }
1809 }
1da177e4 1810
d5cbad4b
AS		 1811 clear_bit(port1, hub->busy_bits);
1812 if (!hub->hdev->parent && !hub->busy_bits[0])
1813 usb_enable_root_hub_irq(hub->hdev->bus);
1814
54515fe5
AS		 1815 if (status == 0)
1816 status = finish_port_resume(udev);
1817 if (status < 0) {
1818 dev_dbg(&udev->dev, "can't resume, status %d\n", status);
1819 hub_port_logical_disconnect(hub, port1);
1820 }
1da177e4
LT		 1821 return status;
1822}
1823
1da177e4
LT		 1824static int remote_wakeup(struct usb_device *udev)
1825{
1826 int status = 0;
1827
9ad3d6cc 1828 usb_lock_device(udev);
1da177e4 1829 if (udev->state == USB_STATE_SUSPENDED) {
645daaab 1830 dev_dbg(&udev->dev, "usb %sresume\n", "wakeup-");
1941044a 1831 usb_mark_last_busy(udev);
6b157c9b 1832 status = usb_external_resume_device(udev);
1da177e4 1833 }
9ad3d6cc 1834 usb_unlock_device(udev);
1da177e4
LT		 1835 return status;
1836}
1837
d388dab7
AS		 1838#else /* CONFIG_USB_SUSPEND */
1839
1840/* When CONFIG_USB_SUSPEND isn't set, we never suspend or resume any ports. */
1841
1842int usb_port_suspend(struct usb_device *udev)
1843{
1844 return 0;
1845}
1846
d388dab7
AS		 1847int usb_port_resume(struct usb_device *udev)
1848{
54515fe5
AS		 1849 int status = 0;
1850
1851 /* However we may need to do a reset-resume */
1852 if (udev->reset_resume) {
1853 dev_dbg(&udev->dev, "reset-resume\n");
1854 status = usb_reset_device(udev);
1855 }
1856 return status;
d388dab7
AS		 1857}
1858
1859static inline int remote_wakeup(struct usb_device *udev)
1860{
1861 return 0;
1862}
1863
1864#endif
1865
db690874 1866static int hub_suspend(struct usb_interface *intf, pm_message_t msg)
1da177e4
LT		 1867{
1868 struct usb_hub *hub = usb_get_intfdata (intf);
1869 struct usb_device *hdev = hub->hdev;
1870 unsigned port1;
1da177e4 1871
c9f89fa4 1872 /* fail if children aren't already suspended */
1da177e4
LT		 1873 for (port1 = 1; port1 <= hdev->maxchild; port1++) {
1874 struct usb_device *udev;
1875
1876 udev = hdev->children [port1-1];
114b368c 1877 if (udev && msg.event == PM_EVENT_SUSPEND &&
f3f3253d 1878#ifdef CONFIG_USB_SUSPEND
114b368c
AS		 1879 udev->state != USB_STATE_SUSPENDED
1880#else
1881 udev->dev.power.power_state.event
1882 == PM_EVENT_ON
f3f3253d 1883#endif
114b368c 1884 ) {
645daaab
AS		 1885 if (!hdev->auto_pm)
1886 dev_dbg(&intf->dev, "port %d nyet suspended\n",
1887 port1);
c9f89fa4
DB		 1888 return -EBUSY;
1889 }
1da177e4
LT		 1890 }
1891
40f122f3
AS		 1892 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1893
12f1ff83
AS		 1894 /* stop khubd and related activity */
1895 hub_quiesce(hub);
b6f6436d 1896 return 0;
1da177e4
LT		 1897}
1898
1899static int hub_resume(struct usb_interface *intf)
1900{
1da177e4 1901 struct usb_hub *hub = usb_get_intfdata (intf);
1da177e4 1902
40f122f3
AS		 1903 dev_dbg(&intf->dev, "%s\n", __FUNCTION__);
1904
a8e7c565 1905 /* tell khubd to look for changes on this hub */
f3f3253d 1906 hub_activate(hub);
1da177e4
LT		 1907 return 0;
1908}
1909
b41a60ec 1910static int hub_reset_resume(struct usb_interface *intf)
f07600cf 1911{
b41a60ec 1912 struct usb_hub *hub = usb_get_intfdata(intf);
f07600cf
AS		 1913 struct usb_device *hdev = hub->hdev;
1914 int port1;
1915
b41a60ec
AS		 1916 hub_power_on(hub);
1917
f07600cf
AS		 1918 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
1919 struct usb_device *child = hdev->children[port1-1];
1920
1921 if (child) {
b41a60ec
AS		 1922
1923 /* For "USB_PERSIST"-enabled children we must
1924 * mark the child device for reset-resume and
1925 * turn off the connect-change status to prevent
1926 * khubd from disconnecting it later.
1927 */
1928 if (USB_PERSIST && child->persist_enabled) {
1929 child->reset_resume = 1;
1930 clear_port_feature(hdev, port1,
1931 USB_PORT_FEAT_C_CONNECTION);
1932
1933 /* Otherwise we must disconnect the child,
1934 * but as we may not lock the child device here
1935 * we have to do a "logical" disconnect.
1936 */
1937 } else {
1938 hub_port_logical_disconnect(hub, port1);
1939 }
f07600cf
AS		 1940 }
1941 }
f07600cf 1942
f07600cf
AS		 1943 hub_activate(hub);
1944 return 0;
1945}
1946
54515fe5
AS		 1947/**
1948 * usb_root_hub_lost_power - called by HCD if the root hub lost Vbus power
1949 * @rhdev: struct usb_device for the root hub
1950 *
1951 * The USB host controller driver calls this function when its root hub
1952 * is resumed and Vbus power has been interrupted or the controller
1953 * has been reset. The routine marks @rhdev as having lost power. When
1954 * the hub driver is resumed it will take notice; if CONFIG_USB_PERSIST
1955 * is enabled then it will carry out power-session recovery, otherwise
1956 * it will disconnect all the child devices.
1957 */
1958void usb_root_hub_lost_power(struct usb_device *rhdev)
1959{
1960 dev_warn(&rhdev->dev, "root hub lost power or was reset\n");
1961 rhdev->reset_resume = 1;
1962}
1963EXPORT_SYMBOL_GPL(usb_root_hub_lost_power);
1964
d388dab7
AS		 1965#else /* CONFIG_PM */
1966
1967static inline int remote_wakeup(struct usb_device *udev)
1968{
1969 return 0;
1970}
1971
f07600cf
AS		 1972#define hub_suspend NULL
1973#define hub_resume NULL
1974#define hub_reset_resume NULL
d388dab7
AS		 1975#endif
1976
1da177e4
LT		 1977
1978/* USB 2.0 spec, 7.1.7.3 / fig 7-29:
1979 *
1980 * Between connect detection and reset signaling there must be a delay
1981 * of 100ms at least for debounce and power-settling. The corresponding
1982 * timer shall restart whenever the downstream port detects a disconnect.
1983 *
1984 * Apparently there are some bluetooth and irda-dongles and a number of
1985 * low-speed devices for which this debounce period may last over a second.
1986 * Not covered by the spec - but easy to deal with.
1987 *
1988 * This implementation uses a 1500ms total debounce timeout; if the
1989 * connection isn't stable by then it returns -ETIMEDOUT. It checks
1990 * every 25ms for transient disconnects. When the port status has been
1991 * unchanged for 100ms it returns the port status.
1992 */
1993
1994#define HUB_DEBOUNCE_TIMEOUT 1500
1995#define HUB_DEBOUNCE_STEP 25
1996#define HUB_DEBOUNCE_STABLE 100
1997
1998static int hub_port_debounce(struct usb_hub *hub, int port1)
1999{
2000 int ret;
2001 int total_time, stable_time = 0;
2002 u16 portchange, portstatus;
2003 unsigned connection = 0xffff;
2004
2005 for (total_time = 0; ; total_time += HUB_DEBOUNCE_STEP) {
2006 ret = hub_port_status(hub, port1, &portstatus, &portchange);
2007 if (ret < 0)
2008 return ret;
2009
2010 if (!(portchange & USB_PORT_STAT_C_CONNECTION) &&
2011 (portstatus & USB_PORT_STAT_CONNECTION) == connection) {
2012 stable_time += HUB_DEBOUNCE_STEP;
2013 if (stable_time >= HUB_DEBOUNCE_STABLE)
2014 break;
2015 } else {
2016 stable_time = 0;
2017 connection = portstatus & USB_PORT_STAT_CONNECTION;
2018 }
2019
2020 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2021 clear_port_feature(hub->hdev, port1,
2022 USB_PORT_FEAT_C_CONNECTION);
2023 }
2024
2025 if (total_time >= HUB_DEBOUNCE_TIMEOUT)
2026 break;
2027 msleep(HUB_DEBOUNCE_STEP);
2028 }
2029
2030 dev_dbg (hub->intfdev,
2031 "debounce: port %d: total %dms stable %dms status 0x%x\n",
2032 port1, total_time, stable_time, portstatus);
2033
2034 if (stable_time < HUB_DEBOUNCE_STABLE)
2035 return -ETIMEDOUT;
2036 return portstatus;
2037}
2038
2039static void ep0_reinit(struct usb_device *udev)
2040{
2041 usb_disable_endpoint(udev, 0 + USB_DIR_IN);
2042 usb_disable_endpoint(udev, 0 + USB_DIR_OUT);
bdd016ba 2043 usb_enable_endpoint(udev, &udev->ep0);
1da177e4
LT		 2044}
2045
2046#define usb_sndaddr0pipe() (PIPE_CONTROL << 30)
2047#define usb_rcvaddr0pipe() ((PIPE_CONTROL << 30) | USB_DIR_IN)
2048
4326ed0b 2049static int hub_set_address(struct usb_device *udev, int devnum)
1da177e4
LT		 2050{
2051 int retval;
2052
4326ed0b 2053 if (devnum <= 1)
1da177e4
LT		 2054 return -EINVAL;
2055 if (udev->state == USB_STATE_ADDRESS)
2056 return 0;
2057 if (udev->state != USB_STATE_DEFAULT)
2058 return -EINVAL;
2059 retval = usb_control_msg(udev, usb_sndaddr0pipe(),
4326ed0b 2060 USB_REQ_SET_ADDRESS, 0, devnum, 0,
1da177e4
LT		 2061 NULL, 0, USB_CTRL_SET_TIMEOUT);
2062 if (retval == 0) {
4326ed0b 2063 udev->devnum = devnum; /* Device now using proper address */
1da177e4
LT		 2064 usb_set_device_state(udev, USB_STATE_ADDRESS);
2065 ep0_reinit(udev);
2066 }
2067 return retval;
2068}
2069
2070/* Reset device, (re)assign address, get device descriptor.
2071 * Device connection must be stable, no more debouncing needed.
2072 * Returns device in USB_STATE_ADDRESS, except on error.
2073 *
2074 * If this is called for an already-existing device (as part of
2075 * usb_reset_device), the caller must own the device lock. For a
2076 * newly detected device that is not accessible through any global
2077 * pointers, it's not necessary to lock the device.
2078 */
2079static int
2080hub_port_init (struct usb_hub *hub, struct usb_device *udev, int port1,
2081 int retry_counter)
2082{
4186ecf8 2083 static DEFINE_MUTEX(usb_address0_mutex);
1da177e4
LT		 2084
2085 struct usb_device *hdev = hub->hdev;
2086 int i, j, retval;
2087 unsigned delay = HUB_SHORT_RESET_TIME;
2088 enum usb_device_speed oldspeed = udev->speed;
83a07196 2089 char *speed, *type;
4326ed0b 2090 int devnum = udev->devnum;
1da177e4
LT		 2091
2092 /* root hub ports have a slightly longer reset period
2093 * (from USB 2.0 spec, section 7.1.7.5)
2094 */
2095 if (!hdev->parent) {
2096 delay = HUB_ROOT_RESET_TIME;
2097 if (port1 == hdev->bus->otg_port)
2098 hdev->bus->b_hnp_enable = 0;
2099 }
2100
2101 /* Some low speed devices have problems with the quick delay, so */
2102 /* be a bit pessimistic with those devices. RHbug #23670 */
2103 if (oldspeed == USB_SPEED_LOW)
2104 delay = HUB_LONG_RESET_TIME;
2105
4186ecf8 2106 mutex_lock(&usb_address0_mutex);
1da177e4
LT		 2107
2108 /* Reset the device; full speed may morph to high speed */
2109 retval = hub_port_reset(hub, port1, udev, delay);
2110 if (retval < 0) /* error or disconnect */
2111 goto fail;
2112 /* success, speed is known */
2113 retval = -ENODEV;
2114
2115 if (oldspeed != USB_SPEED_UNKNOWN && oldspeed != udev->speed) {
2116 dev_dbg(&udev->dev, "device reset changed speed!\n");
2117 goto fail;
2118 }
2119 oldspeed = udev->speed;
4326ed0b 2120
1da177e4
LT		 2121 /* USB 2.0 section 5.5.3 talks about ep0 maxpacket ...
2122 * it's fixed size except for full speed devices.
5bb6e0ae
IPG		 2123 * For Wireless USB devices, ep0 max packet is always 512 (tho
2124 * reported as 0xff in the device descriptor). WUSB1.0[4.8.1].
1da177e4
LT		 2125 */
2126 switch (udev->speed) {
5bb6e0ae
IPG		 2127 case USB_SPEED_VARIABLE: /* fixed at 512 */
2128 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(512);
2129 break;
1da177e4
LT		 2130 case USB_SPEED_HIGH: /* fixed at 64 */
2131 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2132 break;
2133 case USB_SPEED_FULL: /* 8, 16, 32, or 64 */
2134 /* to determine the ep0 maxpacket size, try to read
2135 * the device descriptor to get bMaxPacketSize0 and
2136 * then correct our initial guess.
2137 */
2138 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(64);
2139 break;
2140 case USB_SPEED_LOW: /* fixed at 8 */
2141 udev->ep0.desc.wMaxPacketSize = __constant_cpu_to_le16(8);
2142 break;
2143 default:
2144 goto fail;
2145 }
2146
83a07196
IPG		 2147 type = "";
2148 switch (udev->speed) {
2149 case USB_SPEED_LOW: speed = "low"; break;
2150 case USB_SPEED_FULL: speed = "full"; break;
2151 case USB_SPEED_HIGH: speed = "high"; break;
2152 case USB_SPEED_VARIABLE:
2153 speed = "variable";
2154 type = "Wireless ";
2155 break;
2156 default: speed = "?"; break;
2157 }
1da177e4 2158 dev_info (&udev->dev,
83a07196
IPG		 2159 "%s %s speed %sUSB device using %s and address %d\n",
2160 (udev->config) ? "reset" : "new", speed, type,
4326ed0b 2161 udev->bus->controller->driver->name, devnum);
1da177e4
LT		 2162
2163 /* Set up TT records, if needed */
2164 if (hdev->tt) {
2165 udev->tt = hdev->tt;
2166 udev->ttport = hdev->ttport;
2167 } else if (udev->speed != USB_SPEED_HIGH
2168 && hdev->speed == USB_SPEED_HIGH) {
2169 udev->tt = &hub->tt;
2170 udev->ttport = port1;
2171 }
2172
2173 /* Why interleave GET_DESCRIPTOR and SET_ADDRESS this way?
2174 * Because device hardware and firmware is sometimes buggy in
2175 * this area, and this is how Linux has done it for ages.
2176 * Change it cautiously.
2177 *
2178 * NOTE: If USE_NEW_SCHEME() is true we will start by issuing
2179 * a 64-byte GET_DESCRIPTOR request. This is what Windows does,
2180 * so it may help with some non-standards-compliant devices.
2181 * Otherwise we start with SET_ADDRESS and then try to read the
2182 * first 8 bytes of the device descriptor to get the ep0 maxpacket
2183 * value.
2184 */
2185 for (i = 0; i < GET_DESCRIPTOR_TRIES; (++i, msleep(100))) {
2186 if (USE_NEW_SCHEME(retry_counter)) {
2187 struct usb_device_descriptor *buf;
2188 int r = 0;
2189
2190#define GET_DESCRIPTOR_BUFSIZE 64
2191 buf = kmalloc(GET_DESCRIPTOR_BUFSIZE, GFP_NOIO);
2192 if (!buf) {
2193 retval = -ENOMEM;
2194 continue;
2195 }
2196
b89ee19a
AS		 2197 /* Retry on all errors; some devices are flakey.
2198 * 255 is for WUSB devices, we actually need to use
2199 * 512 (WUSB1.0[4.8.1]).
1da177e4
LT		 2200 */
2201 for (j = 0; j < 3; ++j) {
2202 buf->bMaxPacketSize0 = 0;
2203 r = usb_control_msg(udev, usb_rcvaddr0pipe(),
2204 USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
2205 USB_DT_DEVICE << 8, 0,
2206 buf, GET_DESCRIPTOR_BUFSIZE,
b89ee19a 2207 USB_CTRL_GET_TIMEOUT);
1da177e4 2208 switch (buf->bMaxPacketSize0) {
5bb6e0ae 2209 case 8: case 16: case 32: case 64: case 255:
1da177e4
LT		 2210 if (buf->bDescriptorType ==
2211 USB_DT_DEVICE) {
2212 r = 0;
2213 break;
2214 }
2215 /* FALL THROUGH */
2216 default:
2217 if (r == 0)
2218 r = -EPROTO;
2219 break;
2220 }
2221 if (r == 0)
2222 break;
2223 }
2224 udev->descriptor.bMaxPacketSize0 =
2225 buf->bMaxPacketSize0;
2226 kfree(buf);
2227
2228 retval = hub_port_reset(hub, port1, udev, delay);
2229 if (retval < 0) /* error or disconnect */
2230 goto fail;
2231 if (oldspeed != udev->speed) {
2232 dev_dbg(&udev->dev,
2233 "device reset changed speed!\n");
2234 retval = -ENODEV;
2235 goto fail;
2236 }
2237 if (r) {
2238 dev_err(&udev->dev, "device descriptor "
2239 "read/%s, error %d\n",
2240 "64", r);
2241 retval = -EMSGSIZE;
2242 continue;
2243 }
2244#undef GET_DESCRIPTOR_BUFSIZE
2245 }
2246
2247 for (j = 0; j < SET_ADDRESS_TRIES; ++j) {
4326ed0b 2248 retval = hub_set_address(udev, devnum);
1da177e4
LT		 2249 if (retval >= 0)
2250 break;
2251 msleep(200);
2252 }
2253 if (retval < 0) {
2254 dev_err(&udev->dev,
2255 "device not accepting address %d, error %d\n",
4326ed0b 2256 devnum, retval);
1da177e4
LT		 2257 goto fail;
2258 }
2259
2260 /* cope with hardware quirkiness:
2261 * - let SET_ADDRESS settle, some device hardware wants it
2262 * - read ep0 maxpacket even for high and low speed,
2263 */
2264 msleep(10);
2265 if (USE_NEW_SCHEME(retry_counter))
2266 break;
2267
2268 retval = usb_get_device_descriptor(udev, 8);
2269 if (retval < 8) {
2270 dev_err(&udev->dev, "device descriptor "
2271 "read/%s, error %d\n",
2272 "8", retval);
2273 if (retval >= 0)
2274 retval = -EMSGSIZE;
2275 } else {
2276 retval = 0;
2277 break;
2278 }
2279 }
2280 if (retval)
2281 goto fail;
2282
5bb6e0ae
IPG		 2283 i = udev->descriptor.bMaxPacketSize0 == 0xff?
2284 512 : udev->descriptor.bMaxPacketSize0;
1da177e4
LT		 2285 if (le16_to_cpu(udev->ep0.desc.wMaxPacketSize) != i) {
2286 if (udev->speed != USB_SPEED_FULL ||
2287 !(i == 8 || i == 16 || i == 32 || i == 64)) {
2288 dev_err(&udev->dev, "ep0 maxpacket = %d\n", i);
2289 retval = -EMSGSIZE;
2290 goto fail;
2291 }
2292 dev_dbg(&udev->dev, "ep0 maxpacket = %d\n", i);
2293 udev->ep0.desc.wMaxPacketSize = cpu_to_le16(i);
2294 ep0_reinit(udev);
2295 }
2296
2297 retval = usb_get_device_descriptor(udev, USB_DT_DEVICE_SIZE);
2298 if (retval < (signed)sizeof(udev->descriptor)) {
2299 dev_err(&udev->dev, "device descriptor read/%s, error %d\n",
2300 "all", retval);
2301 if (retval >= 0)
2302 retval = -ENOMSG;
2303 goto fail;
2304 }
2305
2306 retval = 0;
2307
2308fail:
4326ed0b 2309 if (retval) {
1da177e4 2310 hub_port_disable(hub, port1, 0);
4326ed0b
AS		 2311 udev->devnum = devnum; /* for disconnect processing */
2312 }
4186ecf8 2313 mutex_unlock(&usb_address0_mutex);
1da177e4
LT		 2314 return retval;
2315}
2316
2317static void
2318check_highspeed (struct usb_hub *hub, struct usb_device *udev, int port1)
2319{
2320 struct usb_qualifier_descriptor *qual;
2321 int status;
2322
e94b1766 2323 qual = kmalloc (sizeof *qual, GFP_KERNEL);
1da177e4
LT		 2324 if (qual == NULL)
2325 return;
2326
2327 status = usb_get_descriptor (udev, USB_DT_DEVICE_QUALIFIER, 0,
2328 qual, sizeof *qual);
2329 if (status == sizeof *qual) {
2330 dev_info(&udev->dev, "not running at top speed; "
2331 "connect to a high speed hub\n");
2332 /* hub LEDs are probably harder to miss than syslog */
2333 if (hub->has_indicators) {
2334 hub->indicator[port1-1] = INDICATOR_GREEN_BLINK;
c4028958 2335 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2336 }
2337 }
1bc3c9e1 2338 kfree(qual);
1da177e4
LT		 2339}
2340
2341static unsigned
2342hub_power_remaining (struct usb_hub *hub)
2343{
2344 struct usb_device *hdev = hub->hdev;
2345 int remaining;
55c52718 2346 int port1;
1da177e4 2347
55c52718 2348 if (!hub->limited_power)
1da177e4
LT		 2349 return 0;
2350
55c52718
AS		 2351 remaining = hdev->bus_mA - hub->descriptor->bHubContrCurrent;
2352 for (port1 = 1; port1 <= hdev->maxchild; ++port1) {
2353 struct usb_device *udev = hdev->children[port1 - 1];
2354 int delta;
1da177e4
LT		 2355
2356 if (!udev)
2357 continue;
2358
55c52718
AS		 2359 /* Unconfigured devices may not use more than 100mA,
2360 * or 8mA for OTG ports */
1da177e4 2361 if (udev->actconfig)
55c52718
AS		 2362 delta = udev->actconfig->desc.bMaxPower * 2;
2363 else if (port1 != udev->bus->otg_port || hdev->parent)
2364 delta = 100;
1da177e4 2365 else
55c52718
AS		 2366 delta = 8;
2367 if (delta > hub->mA_per_port)
2368 dev_warn(&udev->dev, "%dmA is over %umA budget "
2369 "for port %d!\n",
2370 delta, hub->mA_per_port, port1);
1da177e4
LT		 2371 remaining -= delta;
2372 }
2373 if (remaining < 0) {
55c52718
AS		 2374 dev_warn(hub->intfdev, "%dmA over power budget!\n",
2375 - remaining);
1da177e4
LT		 2376 remaining = 0;
2377 }
2378 return remaining;
2379}
2380
2381/* Handle physical or logical connection change events.
2382 * This routine is called when:
2383 * a port connection-change occurs;
2384 * a port enable-change occurs (often caused by EMI);
2385 * usb_reset_device() encounters changed descriptors (as from
2386 * a firmware download)
2387 * caller already locked the hub
2388 */
2389static void hub_port_connect_change(struct usb_hub *hub, int port1,
2390 u16 portstatus, u16 portchange)
2391{
2392 struct usb_device *hdev = hub->hdev;
2393 struct device *hub_dev = hub->intfdev;
74ad9bd2 2394 u16 wHubCharacteristics = le16_to_cpu(hub->descriptor->wHubCharacteristics);
1da177e4
LT		 2395 int status, i;
2396
2397 dev_dbg (hub_dev,
2398 "port %d, status %04x, change %04x, %s\n",
2399 port1, portstatus, portchange, portspeed (portstatus));
2400
2401 if (hub->has_indicators) {
2402 set_port_led(hub, port1, HUB_LED_AUTO);
2403 hub->indicator[port1-1] = INDICATOR_AUTO;
2404 }
2405
2406 /* Disconnect any existing devices under this port */
2407 if (hdev->children[port1-1])
2408 usb_disconnect(&hdev->children[port1-1]);
2409 clear_bit(port1, hub->change_bits);
2410
2411#ifdef CONFIG_USB_OTG
2412 /* during HNP, don't repeat the debounce */
2413 if (hdev->bus->is_b_host)
2414 portchange &= ~USB_PORT_STAT_C_CONNECTION;
2415#endif
2416
2417 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2418 status = hub_port_debounce(hub, port1);
d4b7d8e8
AS		 2419 if (status < 0) {
2420 if (printk_ratelimit())
2421 dev_err (hub_dev, "connect-debounce failed, "
2422 "port %d disabled\n", port1);
1da177e4
LT		 2423 goto done;
2424 }
2425 portstatus = status;
2426 }
2427
2428 /* Return now if nothing is connected */
2429 if (!(portstatus & USB_PORT_STAT_CONNECTION)) {
2430
2431 /* maybe switch power back on (e.g. root hub was reset) */
74ad9bd2 2432 if ((wHubCharacteristics & HUB_CHAR_LPSM) < 2
1da177e4
LT		 2433 && !(portstatus & (1 << USB_PORT_FEAT_POWER)))
2434 set_port_feature(hdev, port1, USB_PORT_FEAT_POWER);
2435
2436 if (portstatus & USB_PORT_STAT_ENABLE)
2437 goto done;
2438 return;
2439 }
2440
1da177e4
LT		 2441 for (i = 0; i < SET_CONFIG_TRIES; i++) {
2442 struct usb_device *udev;
2443
2444 /* reallocate for each attempt, since references
2445 * to the previous one can escape in various ways
2446 */
2447 udev = usb_alloc_dev(hdev, hdev->bus, port1);
2448 if (!udev) {
2449 dev_err (hub_dev,
2450 "couldn't allocate port %d usb_device\n",
2451 port1);
2452 goto done;
2453 }
2454
2455 usb_set_device_state(udev, USB_STATE_POWERED);
2456 udev->speed = USB_SPEED_UNKNOWN;
55c52718 2457 udev->bus_mA = hub->mA_per_port;
b6956ffa 2458 udev->level = hdev->level + 1;
55c52718 2459
1da177e4
LT		 2460 /* set the address */
2461 choose_address(udev);
2462 if (udev->devnum <= 0) {
2463 status = -ENOTCONN; /* Don't retry */
2464 goto loop;
2465 }
2466
2467 /* reset and get descriptor */
2468 status = hub_port_init(hub, udev, port1, i);
2469 if (status < 0)
2470 goto loop;
2471
2472 /* consecutive bus-powered hubs aren't reliable; they can
2473 * violate the voltage drop budget. if the new child has
2474 * a "powered" LED, users should notice we didn't enable it
2475 * (without reading syslog), even without per-port LEDs
2476 * on the parent.
2477 */
2478 if (udev->descriptor.bDeviceClass == USB_CLASS_HUB
55c52718 2479 && udev->bus_mA <= 100) {
1da177e4
LT		 2480 u16 devstat;
2481
2482 status = usb_get_status(udev, USB_RECIP_DEVICE, 0,
2483 &devstat);
55c52718 2484 if (status < 2) {
1da177e4
LT		 2485 dev_dbg(&udev->dev, "get status %d ?\n", status);
2486 goto loop_disable;
2487 }
55c52718 2488 le16_to_cpus(&devstat);
1da177e4
LT		 2489 if ((devstat & (1 << USB_DEVICE_SELF_POWERED)) == 0) {
2490 dev_err(&udev->dev,
2491 "can't connect bus-powered hub "
2492 "to this port\n");
2493 if (hub->has_indicators) {
2494 hub->indicator[port1-1] =
2495 INDICATOR_AMBER_BLINK;
c4028958 2496 schedule_delayed_work (&hub->leds, 0);
1da177e4
LT		 2497 }
2498 status = -ENOTCONN; /* Don't retry */
2499 goto loop_disable;
2500 }
2501 }
2502
2503 /* check for devices running slower than they could */
2504 if (le16_to_cpu(udev->descriptor.bcdUSB) >= 0x0200
2505 && udev->speed == USB_SPEED_FULL
2506 && highspeed_hubs != 0)
2507 check_highspeed (hub, udev, port1);
2508
2509 /* Store the parent's children[] pointer. At this point
2510 * udev becomes globally accessible, although presumably
2511 * no one will look at it until hdev is unlocked.
2512 */
1da177e4
LT		 2513 status = 0;
2514
2515 /* We mustn't add new devices if the parent hub has
2516 * been disconnected; we would race with the
2517 * recursively_mark_NOTATTACHED() routine.
2518 */
2519 spin_lock_irq(&device_state_lock);
2520 if (hdev->state == USB_STATE_NOTATTACHED)
2521 status = -ENOTCONN;
2522 else
2523 hdev->children[port1-1] = udev;
2524 spin_unlock_irq(&device_state_lock);
2525
2526 /* Run it through the hoops (find a driver, etc) */
2527 if (!status) {
2528 status = usb_new_device(udev);
2529 if (status) {
2530 spin_lock_irq(&device_state_lock);
2531 hdev->children[port1-1] = NULL;
2532 spin_unlock_irq(&device_state_lock);
2533 }
2534 }
2535
1da177e4
LT		 2536 if (status)
2537 goto loop_disable;
2538
2539 status = hub_power_remaining(hub);
2540 if (status)
55c52718 2541 dev_dbg(hub_dev, "%dmA power budget left\n", status);
1da177e4
LT		 2542
2543 return;
2544
2545loop_disable:
2546 hub_port_disable(hub, port1, 1);
2547loop:
2548 ep0_reinit(udev);
2549 release_address(udev);
2550 usb_put_dev(udev);
ffcdc18d 2551 if ((status == -ENOTCONN) || (status == -ENOTSUPP))
1da177e4
LT		 2552 break;
2553 }
2554
2555done:
2556 hub_port_disable(hub, port1, 1);
2557}
2558
2559static void hub_events(void)
2560{
2561 struct list_head *tmp;
2562 struct usb_device *hdev;
2563 struct usb_interface *intf;
2564 struct usb_hub *hub;
2565 struct device *hub_dev;
2566 u16 hubstatus;
2567 u16 hubchange;
2568 u16 portstatus;
2569 u16 portchange;
2570 int i, ret;
2571 int connect_change;
2572
2573 /*
2574 * We restart the list every time to avoid a deadlock with
2575 * deleting hubs downstream from this one. This should be
2576 * safe since we delete the hub from the event list.
2577 * Not the most efficient, but avoids deadlocks.
2578 */
2579 while (1) {
2580
2581 /* Grab the first entry at the beginning of the list */
2582 spin_lock_irq(&hub_event_lock);
2583 if (list_empty(&hub_event_list)) {
2584 spin_unlock_irq(&hub_event_lock);
2585 break;
2586 }
2587
2588 tmp = hub_event_list.next;
2589 list_del_init(tmp);
2590
2591 hub = list_entry(tmp, struct usb_hub, event_list);
e8054854
AS		 2592 kref_get(&hub->kref);
2593 spin_unlock_irq(&hub_event_lock);
1da177e4 2594
e8054854
AS		 2595 hdev = hub->hdev;
2596 hub_dev = hub->intfdev;
2597 intf = to_usb_interface(hub_dev);
40f122f3 2598 dev_dbg(hub_dev, "state %d ports %d chg %04x evt %04x\n",
1da177e4
LT		 2599 hdev->state, hub->descriptor
2600 ? hub->descriptor->bNbrPorts
2601 : 0,
2602 /* NOTE: expects max 15 ports... */
2603 (u16) hub->change_bits[0],
40f122f3 2604 (u16) hub->event_bits[0]);
1da177e4 2605
1da177e4
LT		 2606 /* Lock the device, then check to see if we were
2607 * disconnected while waiting for the lock to succeed. */
06b84e8a 2608 usb_lock_device(hdev);
e8054854 2609 if (unlikely(hub->disconnected))
1da177e4
LT		 2610 goto loop;
2611
2612 /* If the hub has died, clean up after it */
2613 if (hdev->state == USB_STATE_NOTATTACHED) {
7de18d8b
AS		 2614 hub->error = -ENODEV;
2615 hub_pre_reset(intf);
1da177e4
LT		 2616 goto loop;
2617 }
2618
40f122f3
AS		 2619 /* Autoresume */
2620 ret = usb_autopm_get_interface(intf);
2621 if (ret) {
2622 dev_dbg(hub_dev, "Can't autoresume: %d\n", ret);
2623 goto loop;
2624 }
a8e7c565 2625
40f122f3 2626 /* If this is an inactive hub, do nothing */
1da177e4 2627 if (hub->quiescing)
40f122f3 2628 goto loop_autopm;
1da177e4
LT		 2629
2630 if (hub->error) {
2631 dev_dbg (hub_dev, "resetting for error %d\n",
2632 hub->error);
2633
7de18d8b 2634 ret = usb_reset_composite_device(hdev, intf);
1da177e4
LT		 2635 if (ret) {
2636 dev_dbg (hub_dev,
2637 "error resetting hub: %d\n", ret);
40f122f3 2638 goto loop_autopm;
1da177e4
LT		 2639 }
2640
2641 hub->nerrors = 0;
2642 hub->error = 0;
2643 }
2644
2645 /* deal with port status changes */
2646 for (i = 1; i <= hub->descriptor->bNbrPorts; i++) {
2647 if (test_bit(i, hub->busy_bits))
2648 continue;
2649 connect_change = test_bit(i, hub->change_bits);
2650 if (!test_and_clear_bit(i, hub->event_bits) &&
2651 !connect_change && !hub->activating)
2652 continue;
2653
2654 ret = hub_port_status(hub, i,
2655 &portstatus, &portchange);
2656 if (ret < 0)
2657 continue;
2658
2659 if (hub->activating && !hdev->children[i-1] &&
2660 (portstatus &
2661 USB_PORT_STAT_CONNECTION))
2662 connect_change = 1;
2663
2664 if (portchange & USB_PORT_STAT_C_CONNECTION) {
2665 clear_port_feature(hdev, i,
2666 USB_PORT_FEAT_C_CONNECTION);
2667 connect_change = 1;
2668 }
2669
2670 if (portchange & USB_PORT_STAT_C_ENABLE) {
2671 if (!connect_change)
2672 dev_dbg (hub_dev,
2673 "port %d enable change, "
2674 "status %08x\n",
2675 i, portstatus);
2676 clear_port_feature(hdev, i,
2677 USB_PORT_FEAT_C_ENABLE);
2678
2679 /*
2680 * EM interference sometimes causes badly
2681 * shielded USB devices to be shutdown by
2682 * the hub, this hack enables them again.
2683 * Works at least with mouse driver.
2684 */
2685 if (!(portstatus & USB_PORT_STAT_ENABLE)
2686 && !connect_change
2687 && hdev->children[i-1]) {
2688 dev_err (hub_dev,
2689 "port %i "
2690 "disabled by hub (EMI?), "
2691 "re-enabling...\n",
2692 i);
2693 connect_change = 1;
2694 }
2695 }
2696
2697 if (portchange & USB_PORT_STAT_C_SUSPEND) {
2698 clear_port_feature(hdev, i,
2699 USB_PORT_FEAT_C_SUSPEND);
2700 if (hdev->children[i-1]) {
2701 ret = remote_wakeup(hdev->
2702 children[i-1]);
2703 if (ret < 0)
2704 connect_change = 1;
2705 } else {
2706 ret = -ENODEV;
2707 hub_port_disable(hub, i, 1);
2708 }
2709 dev_dbg (hub_dev,
2710 "resume on port %d, status %d\n",
2711 i, ret);
2712 }
2713
2714 if (portchange & USB_PORT_STAT_C_OVERCURRENT) {
2715 dev_err (hub_dev,
2716 "over-current change on port %d\n",
2717 i);
2718 clear_port_feature(hdev, i,
2719 USB_PORT_FEAT_C_OVER_CURRENT);
2720 hub_power_on(hub);
2721 }
2722
2723 if (portchange & USB_PORT_STAT_C_RESET) {
2724 dev_dbg (hub_dev,
2725 "reset change on port %d\n",
2726 i);
2727 clear_port_feature(hdev, i,
2728 USB_PORT_FEAT_C_RESET);
2729 }
2730
2731 if (connect_change)
2732 hub_port_connect_change(hub, i,
2733 portstatus, portchange);
2734 } /* end for i */
2735
2736 /* deal with hub status changes */
2737 if (test_and_clear_bit(0, hub->event_bits) == 0)
2738 ; /* do nothing */
2739 else if (hub_hub_status(hub, &hubstatus, &hubchange) < 0)
2740 dev_err (hub_dev, "get_hub_status failed\n");
2741 else {
2742 if (hubchange & HUB_CHANGE_LOCAL_POWER) {
2743 dev_dbg (hub_dev, "power change\n");
2744 clear_hub_feature(hdev, C_HUB_LOCAL_POWER);
55c52718
AS		 2745 if (hubstatus & HUB_STATUS_LOCAL_POWER)
2746 /* FIXME: Is this always true? */
2747 hub->limited_power = 0;
2748 else
2749 hub->limited_power = 1;
1da177e4
LT		 2750 }
2751 if (hubchange & HUB_CHANGE_OVERCURRENT) {
2752 dev_dbg (hub_dev, "overcurrent change\n");
2753 msleep(500); /* Cool down */
2754 clear_hub_feature(hdev, C_HUB_OVER_CURRENT);
2755 hub_power_on(hub);
2756 }
2757 }
2758
2759 hub->activating = 0;
2760
d5926ae7
AS		 2761 /* If this is a root hub, tell the HCD it's okay to
2762 * re-enable port-change interrupts now. */
d5cbad4b 2763 if (!hdev->parent && !hub->busy_bits[0])
d5926ae7
AS		 2764 usb_enable_root_hub_irq(hdev->bus);
2765
40f122f3
AS		 2766loop_autopm:
2767 /* Allow autosuspend if we're not going to run again */
2768 if (list_empty(&hub->event_list))
2769 usb_autopm_enable(intf);
1da177e4
LT		 2770loop:
2771 usb_unlock_device(hdev);
e8054854 2772 kref_put(&hub->kref, hub_release);
1da177e4
LT		 2773
2774 } /* end while (1) */
2775}
2776
2777static int hub_thread(void *__unused)
2778{
83144186 2779 set_freezable();
1da177e4
LT		 2780 do {
2781 hub_events();
9c8d6178
AM		 2782 wait_event_interruptible(khubd_wait,
2783 !list_empty(&hub_event_list) ||
2784 kthread_should_stop());
3e1d1d28 2785 try_to_freeze();
9c8d6178 2786 } while (!kthread_should_stop() || !list_empty(&hub_event_list));
1da177e4 2787
9c8d6178
AM		 2788 pr_debug("%s: khubd exiting\n", usbcore_name);
2789 return 0;
1da177e4
LT		 2790}
2791
2792static struct usb_device_id hub_id_table [] = {
2793 { .match_flags = USB_DEVICE_ID_MATCH_DEV_CLASS,
2794 .bDeviceClass = USB_CLASS_HUB},
2795 { .match_flags = USB_DEVICE_ID_MATCH_INT_CLASS,
2796 .bInterfaceClass = USB_CLASS_HUB},
2797 { } /* Terminating entry */
2798};
2799
2800MODULE_DEVICE_TABLE (usb, hub_id_table);
2801
2802static struct usb_driver hub_driver = {
1da177e4
LT		 2803 .name = "hub",
2804 .probe = hub_probe,
2805 .disconnect = hub_disconnect,
2806 .suspend = hub_suspend,
2807 .resume = hub_resume,
f07600cf 2808 .reset_resume = hub_reset_resume,
7de18d8b
AS		 2809 .pre_reset = hub_pre_reset,
2810 .post_reset = hub_post_reset,
1da177e4
LT		 2811 .ioctl = hub_ioctl,
2812 .id_table = hub_id_table,
40f122f3 2813 .supports_autosuspend = 1,
1da177e4
LT		 2814};
2815
2816int usb_hub_init(void)
2817{
1da177e4
LT		 2818 if (usb_register(&hub_driver) < 0) {
2819 printk(KERN_ERR "%s: can't register hub driver\n",
2820 usbcore_name);
2821 return -1;
2822 }
2823
9c8d6178
AM		 2824 khubd_task = kthread_run(hub_thread, NULL, "khubd");
2825 if (!IS_ERR(khubd_task))
1da177e4 2826 return 0;
1da177e4
LT		 2827
2828 /* Fall through if kernel_thread failed */
2829 usb_deregister(&hub_driver);
2830 printk(KERN_ERR "%s: can't start khubd\n", usbcore_name);
2831
2832 return -1;
2833}
2834
2835void usb_hub_cleanup(void)
2836{
9c8d6178 2837 kthread_stop(khubd_task);
1da177e4
LT		 2838
2839 /*
2840 * Hub resources are freed for us by usb_deregister. It calls
2841 * usb_driver_purge on every device which in turn calls that
2842 * devices disconnect function if it is using this driver.
2843 * The hub_disconnect function takes care of releasing the
2844 * individual hub resources. -greg
2845 */
2846 usb_deregister(&hub_driver);
2847} /* usb_hub_cleanup() */
2848
1da177e4
LT		 2849static int config_descriptors_changed(struct usb_device *udev)
2850{
2851 unsigned index;
2852 unsigned len = 0;
2853 struct usb_config_descriptor *buf;
2854
2855 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2856 if (len < le16_to_cpu(udev->config[index].desc.wTotalLength))
2857 len = le16_to_cpu(udev->config[index].desc.wTotalLength);
2858 }
e94b1766 2859 buf = kmalloc (len, GFP_KERNEL);
1da177e4
LT		 2860 if (buf == NULL) {
2861 dev_err(&udev->dev, "no mem to re-read configs after reset\n");
2862 /* assume the worst */
2863 return 1;
2864 }
2865 for (index = 0; index < udev->descriptor.bNumConfigurations; index++) {
2866 int length;
2867 int old_length = le16_to_cpu(udev->config[index].desc.wTotalLength);
2868
2869 length = usb_get_descriptor(udev, USB_DT_CONFIG, index, buf,
2870 old_length);
2871 if (length < old_length) {
2872 dev_dbg(&udev->dev, "config index %d, error %d\n",
2873 index, length);
2874 break;
2875 }
2876 if (memcmp (buf, udev->rawdescriptors[index], old_length)
2877 != 0) {
2878 dev_dbg(&udev->dev, "config index %d changed (#%d)\n",
2879 index, buf->bConfigurationValue);
2880 break;
2881 }
2882 }
2883 kfree(buf);
2884 return index != udev->descriptor.bNumConfigurations;
2885}
2886
2887/**
2888 * usb_reset_device - perform a USB port reset to reinitialize a device
2889 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
2890 *
79efa097
AS		 2891 * WARNING - don't use this routine to reset a composite device
2892 * (one with multiple interfaces owned by separate drivers)!
2893 * Use usb_reset_composite_device() instead.
1da177e4
LT		 2894 *
2895 * Do a port reset, reassign the device's address, and establish its
2896 * former operating configuration. If the reset fails, or the device's
2897 * descriptors change from their values before the reset, or the original
2898 * configuration and altsettings cannot be restored, a flag will be set
2899 * telling khubd to pretend the device has been disconnected and then
2900 * re-connected. All drivers will be unbound, and the device will be
2901 * re-enumerated and probed all over again.
2902 *
2903 * Returns 0 if the reset succeeded, -ENODEV if the device has been
2904 * flagged for logical disconnection, or some other negative error code
2905 * if the reset wasn't even attempted.
2906 *
2907 * The caller must own the device lock. For example, it's safe to use
2908 * this from a driver probe() routine after downloading new firmware.
2909 * For calls that might not occur during probe(), drivers should lock
2910 * the device using usb_lock_device_for_reset().
6bc6cff5
AS		 2911 *
2912 * Locking exception: This routine may also be called from within an
2913 * autoresume handler. Such usage won't conflict with other tasks
2914 * holding the device lock because these tasks should always call
2915 * usb_autopm_resume_device(), thereby preventing any unwanted autoresume.
1da177e4
LT		 2916 */
2917int usb_reset_device(struct usb_device *udev)
2918{
2919 struct usb_device *parent_hdev = udev->parent;
2920 struct usb_hub *parent_hub;
2921 struct usb_device_descriptor descriptor = udev->descriptor;
12c3da34
AS		 2922 int i, ret = 0;
2923 int port1 = udev->portnum;
1da177e4
LT		 2924
2925 if (udev->state == USB_STATE_NOTATTACHED ||
2926 udev->state == USB_STATE_SUSPENDED) {
2927 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
2928 udev->state);
2929 return -EINVAL;
2930 }
2931
2932 if (!parent_hdev) {
2933 /* this requires hcd-specific logic; see OHCI hc_restart() */
2934 dev_dbg(&udev->dev, "%s for root hub!\n", __FUNCTION__);
2935 return -EISDIR;
2936 }
1da177e4
LT		 2937 parent_hub = hdev_to_hub(parent_hdev);
2938
1da177e4
LT		 2939 set_bit(port1, parent_hub->busy_bits);
2940 for (i = 0; i < SET_CONFIG_TRIES; ++i) {
2941
2942 /* ep0 maxpacket size may change; let the HCD know about it.
2943 * Other endpoints will be handled by re-enumeration. */
2944 ep0_reinit(udev);
2945 ret = hub_port_init(parent_hub, udev, port1, i);
dd4dd19e 2946 if (ret >= 0 || ret == -ENOTCONN || ret == -ENODEV)
1da177e4
LT		 2947 break;
2948 }
2949 clear_bit(port1, parent_hub->busy_bits);
d5cbad4b
AS		 2950 if (!parent_hdev->parent && !parent_hub->busy_bits[0])
2951 usb_enable_root_hub_irq(parent_hdev->bus);
2952
1da177e4
LT		 2953 if (ret < 0)
2954 goto re_enumerate;
2955
2956 /* Device might have changed firmware (DFU or similar) */
2957 if (memcmp(&udev->descriptor, &descriptor, sizeof descriptor)
2958 || config_descriptors_changed (udev)) {
2959 dev_info(&udev->dev, "device firmware changed\n");
2960 udev->descriptor = descriptor; /* for disconnect() calls */
2961 goto re_enumerate;
2962 }
2963
2964 if (!udev->actconfig)
2965 goto done;
2966
2967 ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
2968 USB_REQ_SET_CONFIGURATION, 0,
2969 udev->actconfig->desc.bConfigurationValue, 0,
2970 NULL, 0, USB_CTRL_SET_TIMEOUT);
2971 if (ret < 0) {
2972 dev_err(&udev->dev,
2973 "can't restore configuration #%d (error=%d)\n",
2974 udev->actconfig->desc.bConfigurationValue, ret);
2975 goto re_enumerate;
2976 }
2977 usb_set_device_state(udev, USB_STATE_CONFIGURED);
2978
2979 for (i = 0; i < udev->actconfig->desc.bNumInterfaces; i++) {
2980 struct usb_interface *intf = udev->actconfig->interface[i];
2981 struct usb_interface_descriptor *desc;
2982
2983 /* set_interface resets host side toggle even
2984 * for altsetting zero. the interface may have no driver.
2985 */
2986 desc = &intf->cur_altsetting->desc;
2987 ret = usb_set_interface(udev, desc->bInterfaceNumber,
2988 desc->bAlternateSetting);
2989 if (ret < 0) {
2990 dev_err(&udev->dev, "failed to restore interface %d "
2991 "altsetting %d (error=%d)\n",
2992 desc->bInterfaceNumber,
2993 desc->bAlternateSetting,
2994 ret);
2995 goto re_enumerate;
2996 }
2997 }
2998
2999done:
1da177e4
LT		 3000 return 0;
3001
3002re_enumerate:
3003 hub_port_logical_disconnect(parent_hub, port1);
3004 return -ENODEV;
3005}
140d8f68 3006EXPORT_SYMBOL(usb_reset_device);
79efa097
AS		 3007
3008/**
3009 * usb_reset_composite_device - warn interface drivers and perform a USB port reset
3010 * @udev: device to reset (not in SUSPENDED or NOTATTACHED state)
3011 * @iface: interface bound to the driver making the request (optional)
3012 *
3013 * Warns all drivers bound to registered interfaces (using their pre_reset
3014 * method), performs the port reset, and then lets the drivers know that
3015 * the reset is over (using their post_reset method).
3016 *
3017 * Return value is the same as for usb_reset_device().
3018 *
3019 * The caller must own the device lock. For example, it's safe to use
3020 * this from a driver probe() routine after downloading new firmware.
3021 * For calls that might not occur during probe(), drivers should lock
3022 * the device using usb_lock_device_for_reset().
3023 *
3024 * The interface locks are acquired during the pre_reset stage and released
3025 * during the post_reset stage. However if iface is not NULL and is
3026 * currently being probed, we assume that the caller already owns its
3027 * lock.
3028 */
3029int usb_reset_composite_device(struct usb_device *udev,
3030 struct usb_interface *iface)
3031{
3032 int ret;
3033 struct usb_host_config *config = udev->actconfig;
3034
3035 if (udev->state == USB_STATE_NOTATTACHED ||
3036 udev->state == USB_STATE_SUSPENDED) {
3037 dev_dbg(&udev->dev, "device reset not allowed in state %d\n",
3038 udev->state);
3039 return -EINVAL;
3040 }
3041
645daaab 3042 /* Prevent autosuspend during the reset */
94fcda1f 3043 usb_autoresume_device(udev);
645daaab 3044
79efa097
AS		 3045 if (iface && iface->condition != USB_INTERFACE_BINDING)
3046 iface = NULL;
3047
3048 if (config) {
3049 int i;
3050 struct usb_interface *cintf;
3051 struct usb_driver *drv;
3052
3053 for (i = 0; i < config->desc.bNumInterfaces; ++i) {
3054 cintf = config->interface[i];
3055 if (cintf != iface)
3056 down(&cintf->dev.sem);
3057 if (device_is_registered(&cintf->dev) &&
3058 cintf->dev.driver) {
3059 drv = to_usb_driver(cintf->dev.driver);
3060 if (drv->pre_reset)
3061 (drv->pre_reset)(cintf);
f07600cf 3062 /* FIXME: Unbind if pre_reset returns an error or isn't defined */
79efa097
AS		 3063 }
3064 }
3065 }
3066
3067 ret = usb_reset_device(udev);
3068
3069 if (config) {
3070 int i;
3071 struct usb_interface *cintf;
3072 struct usb_driver *drv;
3073
3074 for (i = config->desc.bNumInterfaces - 1; i >= 0; --i) {
3075 cintf = config->interface[i];
3076 if (device_is_registered(&cintf->dev) &&
3077 cintf->dev.driver) {
3078 drv = to_usb_driver(cintf->dev.driver);
3079 if (drv->post_reset)
f07600cf
AS		 3080 (drv->post_reset)(cintf);
3081 /* FIXME: Unbind if post_reset returns an error or isn't defined */
79efa097
AS		 3082 }
3083 if (cintf != iface)
3084 up(&cintf->dev.sem);
3085 }
3086 }
3087
94fcda1f 3088 usb_autosuspend_device(udev);
79efa097
AS		 3089 return ret;
3090}
140d8f68 3091EXPORT_SYMBOL(usb_reset_composite_device);
kernel source for telekom puls (alcatel/mediatek)